1 /*
2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "precompiled.hpp"
25 #include "gc_interface/collectedHeap.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/binaryTreeDictionary.hpp"
28 #include "memory/freeList.hpp"
29 #include "memory/collectorPolicy.hpp"
30 #include "memory/filemap.hpp"
31 #include "memory/freeList.hpp"
32 #include "memory/gcLocker.hpp"
33 #include "memory/metachunk.hpp"
34 #include "memory/metaspace.hpp"
35 #include "memory/metaspaceGCThresholdUpdater.hpp"
36 #include "memory/metaspaceShared.hpp"
37 #include "memory/metaspaceTracer.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "memory/universe.hpp"
40 #include "runtime/atomic.inline.hpp"
41 #include "runtime/globals.hpp"
42 #include "runtime/init.hpp"
43 #include "runtime/java.hpp"
44 #include "runtime/mutex.hpp"
45 #include "runtime/orderAccess.inline.hpp"
46 #include "services/memTracker.hpp"
47 #include "services/memoryService.hpp"
48 #include "utilities/copy.hpp"
49 #include "utilities/debug.hpp"
50 #include "utilities/macros.hpp"
51
52 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
53
54 typedef BinaryTreeDictionary<Metablock, FreeList<Metablock> > BlockTreeDictionary;
55 typedef BinaryTreeDictionary<Metachunk, FreeList<Metachunk> > ChunkTreeDictionary;
56
57 // Set this constant to enable slow integrity checking of the free chunk lists
58 const bool metaspace_slow_verify = false;
59
60 size_t const allocation_from_dictionary_limit = 4 * K;
61
62 MetaWord* last_allocated = 0;
63
64 size_t Metaspace::_compressed_class_space_size;
65 const MetaspaceTracer* Metaspace::_tracer = NULL;
66
67 // Used in declarations in SpaceManager and ChunkManager
68 enum ChunkIndex {
69 ZeroIndex = 0,
70 SpecializedIndex = ZeroIndex,
71 SmallIndex = SpecializedIndex + 1,
72 MediumIndex = SmallIndex + 1,
73 HumongousIndex = MediumIndex + 1,
74 NumberOfFreeLists = 3,
75 NumberOfInUseLists = 4
76 };
77
78 enum ChunkSizes { // in words.
79 ClassSpecializedChunk = 128,
80 SpecializedChunk = 128,
81 ClassSmallChunk = 256,
82 SmallChunk = 512,
83 ClassMediumChunk = 4 * K,
84 MediumChunk = 8 * K
85 };
86
87 static ChunkIndex next_chunk_index(ChunkIndex i) {
88 assert(i < NumberOfInUseLists, "Out of bound");
89 return (ChunkIndex) (i+1);
90 }
91
92 volatile intptr_t MetaspaceGC::_capacity_until_GC = 0;
93 uint MetaspaceGC::_shrink_factor = 0;
94 bool MetaspaceGC::_should_concurrent_collect = false;
95
96 typedef class FreeList<Metachunk> ChunkList;
97
98 // Manages the global free lists of chunks.
99 class ChunkManager : public CHeapObj<mtInternal> {
100 friend class TestVirtualSpaceNodeTest;
101
102 // Free list of chunks of different sizes.
103 // SpecializedChunk
104 // SmallChunk
105 // MediumChunk
106 // HumongousChunk
107 ChunkList _free_chunks[NumberOfFreeLists];
108
109 // HumongousChunk
110 ChunkTreeDictionary _humongous_dictionary;
111
112 // ChunkManager in all lists of this type
113 size_t _free_chunks_total;
114 size_t _free_chunks_count;
115
116 void dec_free_chunks_total(size_t v) {
117 assert(_free_chunks_count > 0 &&
118 _free_chunks_total > 0,
119 "About to go negative");
120 Atomic::add_ptr(-1, &_free_chunks_count);
121 jlong minus_v = (jlong) - (jlong) v;
122 Atomic::add_ptr(minus_v, &_free_chunks_total);
123 }
124
125 // Debug support
126
127 size_t sum_free_chunks();
128 size_t sum_free_chunks_count();
129
130 void locked_verify_free_chunks_total();
131 void slow_locked_verify_free_chunks_total() {
132 if (metaspace_slow_verify) {
133 locked_verify_free_chunks_total();
134 }
135 }
136 void locked_verify_free_chunks_count();
137 void slow_locked_verify_free_chunks_count() {
138 if (metaspace_slow_verify) {
139 locked_verify_free_chunks_count();
140 }
141 }
142 void verify_free_chunks_count();
143
144 public:
145
146 ChunkManager(size_t specialized_size, size_t small_size, size_t medium_size)
147 : _free_chunks_total(0), _free_chunks_count(0) {
148 _free_chunks[SpecializedIndex].set_size(specialized_size);
149 _free_chunks[SmallIndex].set_size(small_size);
150 _free_chunks[MediumIndex].set_size(medium_size);
151 }
152
153 // add or delete (return) a chunk to the global freelist.
154 Metachunk* chunk_freelist_allocate(size_t word_size);
155
156 // Map a size to a list index assuming that there are lists
157 // for special, small, medium, and humongous chunks.
158 static ChunkIndex list_index(size_t size);
159
160 // Remove the chunk from its freelist. It is
161 // expected to be on one of the _free_chunks[] lists.
162 void remove_chunk(Metachunk* chunk);
163
164 // Add the simple linked list of chunks to the freelist of chunks
165 // of type index.
166 void return_chunks(ChunkIndex index, Metachunk* chunks);
167
168 // Total of the space in the free chunks list
169 size_t free_chunks_total_words();
170 size_t free_chunks_total_bytes();
171
172 // Number of chunks in the free chunks list
173 size_t free_chunks_count();
174
175 void inc_free_chunks_total(size_t v, size_t count = 1) {
176 Atomic::add_ptr(count, &_free_chunks_count);
177 Atomic::add_ptr(v, &_free_chunks_total);
178 }
179 ChunkTreeDictionary* humongous_dictionary() {
180 return &_humongous_dictionary;
181 }
182
183 ChunkList* free_chunks(ChunkIndex index);
184
185 // Returns the list for the given chunk word size.
186 ChunkList* find_free_chunks_list(size_t word_size);
187
188 // Remove from a list by size. Selects list based on size of chunk.
189 Metachunk* free_chunks_get(size_t chunk_word_size);
190
191 #define index_bounds_check(index) \
192 assert(index == SpecializedIndex || \
193 index == SmallIndex || \
194 index == MediumIndex || \
195 index == HumongousIndex, err_msg("Bad index: %d", (int) index))
196
197 size_t num_free_chunks(ChunkIndex index) const {
198 index_bounds_check(index);
199
200 if (index == HumongousIndex) {
201 return _humongous_dictionary.total_free_blocks();
202 }
203
204 ssize_t count = _free_chunks[index].count();
205 return count == -1 ? 0 : (size_t) count;
206 }
207
208 size_t size_free_chunks_in_bytes(ChunkIndex index) const {
209 index_bounds_check(index);
210
211 size_t word_size = 0;
212 if (index == HumongousIndex) {
213 word_size = _humongous_dictionary.total_size();
214 } else {
215 const size_t size_per_chunk_in_words = _free_chunks[index].size();
216 word_size = size_per_chunk_in_words * num_free_chunks(index);
217 }
218
219 return word_size * BytesPerWord;
220 }
221
222 MetaspaceChunkFreeListSummary chunk_free_list_summary() const {
223 return MetaspaceChunkFreeListSummary(num_free_chunks(SpecializedIndex),
224 num_free_chunks(SmallIndex),
225 num_free_chunks(MediumIndex),
226 num_free_chunks(HumongousIndex),
227 size_free_chunks_in_bytes(SpecializedIndex),
228 size_free_chunks_in_bytes(SmallIndex),
229 size_free_chunks_in_bytes(MediumIndex),
230 size_free_chunks_in_bytes(HumongousIndex));
231 }
232
233 // Debug support
234 void verify();
235 void slow_verify() {
236 if (metaspace_slow_verify) {
237 verify();
238 }
239 }
240 void locked_verify();
241 void slow_locked_verify() {
242 if (metaspace_slow_verify) {
243 locked_verify();
244 }
245 }
246 void verify_free_chunks_total();
247
248 void locked_print_free_chunks(outputStream* st);
249 void locked_print_sum_free_chunks(outputStream* st);
250
251 void print_on(outputStream* st) const;
252 };
253
254 // Used to manage the free list of Metablocks (a block corresponds
255 // to the allocation of a quantum of metadata).
256 class BlockFreelist VALUE_OBJ_CLASS_SPEC {
257 BlockTreeDictionary* _dictionary;
258
259 // Only allocate and split from freelist if the size of the allocation
260 // is at least 1/4th the size of the available block.
261 const static int WasteMultiplier = 4;
262
263 // Accessors
264 BlockTreeDictionary* dictionary() const { return _dictionary; }
265
266 public:
267 BlockFreelist();
268 ~BlockFreelist();
269
270 // Get and return a block to the free list
271 MetaWord* get_block(size_t word_size);
272 void return_block(MetaWord* p, size_t word_size);
273
274 size_t total_size() {
275 if (dictionary() == NULL) {
276 return 0;
277 } else {
278 return dictionary()->total_size();
279 }
280 }
281
282 void print_on(outputStream* st) const;
283 };
284
285 // A VirtualSpaceList node.
286 class VirtualSpaceNode : public CHeapObj<mtClass> {
287 friend class VirtualSpaceList;
288
289 // Link to next VirtualSpaceNode
290 VirtualSpaceNode* _next;
291
292 // total in the VirtualSpace
293 MemRegion _reserved;
294 ReservedSpace _rs;
295 VirtualSpace _virtual_space;
296 MetaWord* _top;
297 // count of chunks contained in this VirtualSpace
298 uintx _container_count;
299
300 // Convenience functions to access the _virtual_space
301 char* low() const { return virtual_space()->low(); }
302 char* high() const { return virtual_space()->high(); }
303
304 // The first Metachunk will be allocated at the bottom of the
305 // VirtualSpace
306 Metachunk* first_chunk() { return (Metachunk*) bottom(); }
307
308 // Committed but unused space in the virtual space
309 size_t free_words_in_vs() const;
310 public:
311
312 VirtualSpaceNode(size_t byte_size);
313 VirtualSpaceNode(ReservedSpace rs) : _top(NULL), _next(NULL), _rs(rs), _container_count(0) {}
314 ~VirtualSpaceNode();
315
316 // Convenience functions for logical bottom and end
317 MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
318 MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
319
320 bool contains(const void* ptr) { return ptr >= low() && ptr < high(); }
321
322 size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; }
323 size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
324
325 bool is_pre_committed() const { return _virtual_space.special(); }
326
327 // address of next available space in _virtual_space;
328 // Accessors
329 VirtualSpaceNode* next() { return _next; }
330 void set_next(VirtualSpaceNode* v) { _next = v; }
331
332 void set_reserved(MemRegion const v) { _reserved = v; }
333 void set_top(MetaWord* v) { _top = v; }
334
335 // Accessors
336 MemRegion* reserved() { return &_reserved; }
337 VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
338
339 // Returns true if "word_size" is available in the VirtualSpace
340 bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); }
341
342 MetaWord* top() const { return _top; }
343 void inc_top(size_t word_size) { _top += word_size; }
344
345 uintx container_count() { return _container_count; }
346 void inc_container_count();
347 void dec_container_count();
348 #ifdef ASSERT
349 uint container_count_slow();
350 void verify_container_count();
351 #endif
352
353 // used and capacity in this single entry in the list
354 size_t used_words_in_vs() const;
355 size_t capacity_words_in_vs() const;
356
357 bool initialize();
358
359 // get space from the virtual space
360 Metachunk* take_from_committed(size_t chunk_word_size);
361
362 // Allocate a chunk from the virtual space and return it.
363 Metachunk* get_chunk_vs(size_t chunk_word_size);
364
365 // Expands/shrinks the committed space in a virtual space. Delegates
366 // to Virtualspace
367 bool expand_by(size_t min_words, size_t preferred_words);
368
369 // In preparation for deleting this node, remove all the chunks
370 // in the node from any freelist.
371 void purge(ChunkManager* chunk_manager);
372
373 // If an allocation doesn't fit in the current node a new node is created.
374 // Allocate chunks out of the remaining committed space in this node
375 // to avoid wasting that memory.
376 // This always adds up because all the chunk sizes are multiples of
377 // the smallest chunk size.
378 void retire(ChunkManager* chunk_manager);
379
380 #ifdef ASSERT
381 // Debug support
382 void mangle();
383 #endif
384
385 void print_on(outputStream* st) const;
386 };
387
388 #define assert_is_ptr_aligned(ptr, alignment) \
389 assert(is_ptr_aligned(ptr, alignment), \
390 err_msg(PTR_FORMAT " is not aligned to " \
391 SIZE_FORMAT, ptr, alignment))
392
393 #define assert_is_size_aligned(size, alignment) \
394 assert(is_size_aligned(size, alignment), \
395 err_msg(SIZE_FORMAT " is not aligned to " \
396 SIZE_FORMAT, size, alignment))
397
398
399 // Decide if large pages should be committed when the memory is reserved.
400 static bool should_commit_large_pages_when_reserving(size_t bytes) {
401 if (UseLargePages && UseLargePagesInMetaspace && !os::can_commit_large_page_memory()) {
402 size_t words = bytes / BytesPerWord;
403 bool is_class = false; // We never reserve large pages for the class space.
404 if (MetaspaceGC::can_expand(words, is_class) &&
405 MetaspaceGC::allowed_expansion() >= words) {
406 return true;
407 }
408 }
409
410 return false;
411 }
412
413 // byte_size is the size of the associated virtualspace.
414 VirtualSpaceNode::VirtualSpaceNode(size_t bytes) : _top(NULL), _next(NULL), _rs(), _container_count(0) {
415 assert_is_size_aligned(bytes, Metaspace::reserve_alignment());
416
417 #if INCLUDE_CDS
418 // This allocates memory with mmap. For DumpSharedspaces, try to reserve
419 // configurable address, generally at the top of the Java heap so other
420 // memory addresses don't conflict.
421 if (DumpSharedSpaces) {
422 bool large_pages = false; // No large pages when dumping the CDS archive.
423 char* shared_base = (char*)align_ptr_up((char*)SharedBaseAddress, Metaspace::reserve_alignment());
424
425 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages, shared_base, 0);
426 if (_rs.is_reserved()) {
427 assert(shared_base == 0 || _rs.base() == shared_base, "should match");
428 } else {
429 // Get a mmap region anywhere if the SharedBaseAddress fails.
430 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
431 }
432 MetaspaceShared::set_shared_rs(&_rs);
433 } else
434 #endif
435 {
436 bool large_pages = should_commit_large_pages_when_reserving(bytes);
437
438 _rs = ReservedSpace(bytes, Metaspace::reserve_alignment(), large_pages);
439 }
440
441 if (_rs.is_reserved()) {
442 assert(_rs.base() != NULL, "Catch if we get a NULL address");
443 assert(_rs.size() != 0, "Catch if we get a 0 size");
444 assert_is_ptr_aligned(_rs.base(), Metaspace::reserve_alignment());
445 assert_is_size_aligned(_rs.size(), Metaspace::reserve_alignment());
446
447 MemTracker::record_virtual_memory_type((address)_rs.base(), mtClass);
448 }
449 }
450
451 void VirtualSpaceNode::purge(ChunkManager* chunk_manager) {
452 Metachunk* chunk = first_chunk();
453 Metachunk* invalid_chunk = (Metachunk*) top();
454 while (chunk < invalid_chunk ) {
455 assert(chunk->is_tagged_free(), "Should be tagged free");
456 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
457 chunk_manager->remove_chunk(chunk);
458 assert(chunk->next() == NULL &&
459 chunk->prev() == NULL,
460 "Was not removed from its list");
461 chunk = (Metachunk*) next;
462 }
463 }
464
465 #ifdef ASSERT
466 uint VirtualSpaceNode::container_count_slow() {
467 uint count = 0;
468 Metachunk* chunk = first_chunk();
469 Metachunk* invalid_chunk = (Metachunk*) top();
470 while (chunk < invalid_chunk ) {
471 MetaWord* next = ((MetaWord*)chunk) + chunk->word_size();
472 // Don't count the chunks on the free lists. Those are
473 // still part of the VirtualSpaceNode but not currently
474 // counted.
475 if (!chunk->is_tagged_free()) {
476 count++;
477 }
478 chunk = (Metachunk*) next;
479 }
480 return count;
481 }
482 #endif
483
484 // List of VirtualSpaces for metadata allocation.
485 class VirtualSpaceList : public CHeapObj<mtClass> {
486 friend class VirtualSpaceNode;
487
488 enum VirtualSpaceSizes {
489 VirtualSpaceSize = 256 * K
490 };
491
492 // Head of the list
493 VirtualSpaceNode* _virtual_space_list;
494 // virtual space currently being used for allocations
495 VirtualSpaceNode* _current_virtual_space;
496
497 // Is this VirtualSpaceList used for the compressed class space
498 bool _is_class;
499
500 // Sum of reserved and committed memory in the virtual spaces
501 size_t _reserved_words;
502 size_t _committed_words;
503
504 // Number of virtual spaces
505 size_t _virtual_space_count;
506
507 ~VirtualSpaceList();
508
509 VirtualSpaceNode* virtual_space_list() const { return _virtual_space_list; }
510
511 void set_virtual_space_list(VirtualSpaceNode* v) {
512 _virtual_space_list = v;
513 }
514 void set_current_virtual_space(VirtualSpaceNode* v) {
515 _current_virtual_space = v;
516 }
517
518 void link_vs(VirtualSpaceNode* new_entry);
519
520 // Get another virtual space and add it to the list. This
521 // is typically prompted by a failed attempt to allocate a chunk
522 // and is typically followed by the allocation of a chunk.
523 bool create_new_virtual_space(size_t vs_word_size);
524
525 // Chunk up the unused committed space in the current
526 // virtual space and add the chunks to the free list.
527 void retire_current_virtual_space();
528
529 public:
530 VirtualSpaceList(size_t word_size);
531 VirtualSpaceList(ReservedSpace rs);
532
533 size_t free_bytes();
534
535 Metachunk* get_new_chunk(size_t word_size,
536 size_t grow_chunks_by_words,
537 size_t medium_chunk_bunch);
538
539 bool expand_node_by(VirtualSpaceNode* node,
540 size_t min_words,
541 size_t preferred_words);
542
543 bool expand_by(size_t min_words,
544 size_t preferred_words);
545
546 VirtualSpaceNode* current_virtual_space() {
547 return _current_virtual_space;
548 }
549
550 bool is_class() const { return _is_class; }
551
552 bool initialization_succeeded() { return _virtual_space_list != NULL; }
553
554 size_t reserved_words() { return _reserved_words; }
555 size_t reserved_bytes() { return reserved_words() * BytesPerWord; }
556 size_t committed_words() { return _committed_words; }
557 size_t committed_bytes() { return committed_words() * BytesPerWord; }
558
559 void inc_reserved_words(size_t v);
560 void dec_reserved_words(size_t v);
561 void inc_committed_words(size_t v);
562 void dec_committed_words(size_t v);
563 void inc_virtual_space_count();
564 void dec_virtual_space_count();
565
566 bool contains(const void* ptr);
567
568 // Unlink empty VirtualSpaceNodes and free it.
569 void purge(ChunkManager* chunk_manager);
570
571 void print_on(outputStream* st) const;
572
573 class VirtualSpaceListIterator : public StackObj {
574 VirtualSpaceNode* _virtual_spaces;
575 public:
576 VirtualSpaceListIterator(VirtualSpaceNode* virtual_spaces) :
577 _virtual_spaces(virtual_spaces) {}
578
579 bool repeat() {
580 return _virtual_spaces != NULL;
581 }
582
583 VirtualSpaceNode* get_next() {
584 VirtualSpaceNode* result = _virtual_spaces;
585 if (_virtual_spaces != NULL) {
586 _virtual_spaces = _virtual_spaces->next();
587 }
588 return result;
589 }
590 };
591 };
592
593 class Metadebug : AllStatic {
594 // Debugging support for Metaspaces
595 static int _allocation_fail_alot_count;
596
597 public:
598
599 static void init_allocation_fail_alot_count();
600 #ifdef ASSERT
601 static bool test_metadata_failure();
602 #endif
603 };
604
605 int Metadebug::_allocation_fail_alot_count = 0;
606
607 // SpaceManager - used by Metaspace to handle allocations
608 class SpaceManager : public CHeapObj<mtClass> {
609 friend class Metaspace;
610 friend class Metadebug;
611
612 private:
613
614 // protects allocations
615 Mutex* const _lock;
616
617 // Type of metadata allocated.
618 Metaspace::MetadataType _mdtype;
619
620 // List of chunks in use by this SpaceManager. Allocations
621 // are done from the current chunk. The list is used for deallocating
622 // chunks when the SpaceManager is freed.
623 Metachunk* _chunks_in_use[NumberOfInUseLists];
624 Metachunk* _current_chunk;
625
626 // Number of small chunks to allocate to a manager
627 // If class space manager, small chunks are unlimited
628 static uint const _small_chunk_limit;
629
630 // Sum of all space in allocated chunks
631 size_t _allocated_blocks_words;
632
633 // Sum of all allocated chunks
634 size_t _allocated_chunks_words;
635 size_t _allocated_chunks_count;
636
637 // Free lists of blocks are per SpaceManager since they
638 // are assumed to be in chunks in use by the SpaceManager
639 // and all chunks in use by a SpaceManager are freed when
640 // the class loader using the SpaceManager is collected.
641 BlockFreelist _block_freelists;
642
643 // protects virtualspace and chunk expansions
644 static const char* _expand_lock_name;
645 static const int _expand_lock_rank;
646 static Mutex* const _expand_lock;
647
648 private:
649 // Accessors
650 Metachunk* chunks_in_use(ChunkIndex index) const { return _chunks_in_use[index]; }
651 void set_chunks_in_use(ChunkIndex index, Metachunk* v) {
652 _chunks_in_use[index] = v;
653 }
654
655 BlockFreelist* block_freelists() const {
656 return (BlockFreelist*) &_block_freelists;
657 }
658
659 Metaspace::MetadataType mdtype() { return _mdtype; }
660
661 VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); }
662 ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
663
664 Metachunk* current_chunk() const { return _current_chunk; }
665 void set_current_chunk(Metachunk* v) {
666 _current_chunk = v;
667 }
668
669 Metachunk* find_current_chunk(size_t word_size);
670
671 // Add chunk to the list of chunks in use
672 void add_chunk(Metachunk* v, bool make_current);
673 void retire_current_chunk();
674
675 Mutex* lock() const { return _lock; }
676
677 const char* chunk_size_name(ChunkIndex index) const;
678
679 protected:
680 void initialize();
681
682 public:
683 SpaceManager(Metaspace::MetadataType mdtype,
684 Mutex* lock);
685 ~SpaceManager();
686
687 enum ChunkMultiples {
688 MediumChunkMultiple = 4
689 };
690
691 bool is_class() { return _mdtype == Metaspace::ClassType; }
692
693 // Accessors
694 size_t specialized_chunk_size() { return (size_t) is_class() ? ClassSpecializedChunk : SpecializedChunk; }
695 size_t small_chunk_size() { return (size_t) is_class() ? ClassSmallChunk : SmallChunk; }
696 size_t medium_chunk_size() { return (size_t) is_class() ? ClassMediumChunk : MediumChunk; }
697 size_t medium_chunk_bunch() { return medium_chunk_size() * MediumChunkMultiple; }
698
699 size_t smallest_chunk_size() { return specialized_chunk_size(); }
700
701 size_t allocated_blocks_words() const { return _allocated_blocks_words; }
702 size_t allocated_blocks_bytes() const { return _allocated_blocks_words * BytesPerWord; }
703 size_t allocated_chunks_words() const { return _allocated_chunks_words; }
704 size_t allocated_chunks_bytes() const { return _allocated_chunks_words * BytesPerWord; }
705 size_t allocated_chunks_count() const { return _allocated_chunks_count; }
706
707 bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
708
709 static Mutex* expand_lock() { return _expand_lock; }
710
711 // Increment the per Metaspace and global running sums for Metachunks
712 // by the given size. This is used when a Metachunk to added to
713 // the in-use list.
714 void inc_size_metrics(size_t words);
715 // Increment the per Metaspace and global running sums Metablocks by the given
716 // size. This is used when a Metablock is allocated.
717 void inc_used_metrics(size_t words);
718 // Delete the portion of the running sums for this SpaceManager. That is,
719 // the globals running sums for the Metachunks and Metablocks are
720 // decremented for all the Metachunks in-use by this SpaceManager.
721 void dec_total_from_size_metrics();
722
723 // Set the sizes for the initial chunks.
724 void get_initial_chunk_sizes(Metaspace::MetaspaceType type,
725 size_t* chunk_word_size,
726 size_t* class_chunk_word_size);
727
728 size_t sum_capacity_in_chunks_in_use() const;
729 size_t sum_used_in_chunks_in_use() const;
730 size_t sum_free_in_chunks_in_use() const;
731 size_t sum_waste_in_chunks_in_use() const;
732 size_t sum_waste_in_chunks_in_use(ChunkIndex index ) const;
733
734 size_t sum_count_in_chunks_in_use();
735 size_t sum_count_in_chunks_in_use(ChunkIndex i);
736
737 Metachunk* get_new_chunk(size_t word_size, size_t grow_chunks_by_words);
738
739 // Block allocation and deallocation.
740 // Allocates a block from the current chunk
741 MetaWord* allocate(size_t word_size);
742
743 // Helper for allocations
744 MetaWord* allocate_work(size_t word_size);
745
746 // Returns a block to the per manager freelist
747 void deallocate(MetaWord* p, size_t word_size);
748
749 // Based on the allocation size and a minimum chunk size,
750 // returned chunk size (for expanding space for chunk allocation).
751 size_t calc_chunk_size(size_t allocation_word_size);
752
753 // Called when an allocation from the current chunk fails.
754 // Gets a new chunk (may require getting a new virtual space),
755 // and allocates from that chunk.
756 MetaWord* grow_and_allocate(size_t word_size);
757
758 // Notify memory usage to MemoryService.
759 void track_metaspace_memory_usage();
760
761 // debugging support.
762
763 void dump(outputStream* const out) const;
764 void print_on(outputStream* st) const;
765 void locked_print_chunks_in_use_on(outputStream* st) const;
766
767 void verify();
768 void verify_chunk_size(Metachunk* chunk);
769 NOT_PRODUCT(void mangle_freed_chunks();)
770 #ifdef ASSERT
771 void verify_allocated_blocks_words();
772 #endif
773
774 size_t get_raw_word_size(size_t word_size) {
775 size_t byte_size = word_size * BytesPerWord;
776
777 size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock));
778 raw_bytes_size = align_size_up(raw_bytes_size, Metachunk::object_alignment());
779
780 size_t raw_word_size = raw_bytes_size / BytesPerWord;
781 assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
782
783 return raw_word_size;
784 }
785 };
786
787 uint const SpaceManager::_small_chunk_limit = 4;
788
789 const char* SpaceManager::_expand_lock_name =
790 "SpaceManager chunk allocation lock";
791 const int SpaceManager::_expand_lock_rank = Monitor::leaf - 1;
792 Mutex* const SpaceManager::_expand_lock =
793 new Mutex(SpaceManager::_expand_lock_rank,
794 SpaceManager::_expand_lock_name,
795 Mutex::_allow_vm_block_flag);
796
797 void VirtualSpaceNode::inc_container_count() {
798 assert_lock_strong(SpaceManager::expand_lock());
799 _container_count++;
800 assert(_container_count == container_count_slow(),
801 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT
802 " container_count_slow() " SIZE_FORMAT,
803 _container_count, container_count_slow()));
804 }
805
806 void VirtualSpaceNode::dec_container_count() {
807 assert_lock_strong(SpaceManager::expand_lock());
808 _container_count--;
809 }
810
811 #ifdef ASSERT
812 void VirtualSpaceNode::verify_container_count() {
813 assert(_container_count == container_count_slow(),
814 err_msg("Inconsistency in container_count _container_count " SIZE_FORMAT
815 " container_count_slow() " SIZE_FORMAT, _container_count, container_count_slow()));
816 }
817 #endif
818
819 // BlockFreelist methods
820
821 BlockFreelist::BlockFreelist() : _dictionary(NULL) {}
822
823 BlockFreelist::~BlockFreelist() {
824 if (_dictionary != NULL) {
825 if (Verbose && TraceMetadataChunkAllocation) {
826 _dictionary->print_free_lists(gclog_or_tty);
827 }
828 delete _dictionary;
829 }
830 }
831
832 void BlockFreelist::return_block(MetaWord* p, size_t word_size) {
833 Metablock* free_chunk = ::new (p) Metablock(word_size);
834 if (dictionary() == NULL) {
835 _dictionary = new BlockTreeDictionary();
836 }
837 dictionary()->return_chunk(free_chunk);
838 }
839
840 MetaWord* BlockFreelist::get_block(size_t word_size) {
841 if (dictionary() == NULL) {
842 return NULL;
843 }
844
845 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
846 // Dark matter. Too small for dictionary.
847 return NULL;
848 }
849
850 Metablock* free_block =
851 dictionary()->get_chunk(word_size, FreeBlockDictionary<Metablock>::atLeast);
852 if (free_block == NULL) {
853 return NULL;
854 }
855
856 const size_t block_size = free_block->size();
857 if (block_size > WasteMultiplier * word_size) {
858 return_block((MetaWord*)free_block, block_size);
859 return NULL;
860 }
861
862 MetaWord* new_block = (MetaWord*)free_block;
863 assert(block_size >= word_size, "Incorrect size of block from freelist");
864 const size_t unused = block_size - word_size;
865 if (unused >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
866 return_block(new_block + word_size, unused);
867 }
868
869 return new_block;
870 }
871
872 void BlockFreelist::print_on(outputStream* st) const {
873 if (dictionary() == NULL) {
874 return;
875 }
876 dictionary()->print_free_lists(st);
877 }
878
879 // VirtualSpaceNode methods
880
881 VirtualSpaceNode::~VirtualSpaceNode() {
882 _rs.release();
883 #ifdef ASSERT
884 size_t word_size = sizeof(*this) / BytesPerWord;
885 Copy::fill_to_words((HeapWord*) this, word_size, 0xf1f1f1f1);
886 #endif
887 }
888
889 size_t VirtualSpaceNode::used_words_in_vs() const {
890 return pointer_delta(top(), bottom(), sizeof(MetaWord));
891 }
892
893 // Space committed in the VirtualSpace
894 size_t VirtualSpaceNode::capacity_words_in_vs() const {
895 return pointer_delta(end(), bottom(), sizeof(MetaWord));
896 }
897
898 size_t VirtualSpaceNode::free_words_in_vs() const {
899 return pointer_delta(end(), top(), sizeof(MetaWord));
900 }
901
902 // Allocates the chunk from the virtual space only.
903 // This interface is also used internally for debugging. Not all
904 // chunks removed here are necessarily used for allocation.
905 Metachunk* VirtualSpaceNode::take_from_committed(size_t chunk_word_size) {
906 // Bottom of the new chunk
907 MetaWord* chunk_limit = top();
908 assert(chunk_limit != NULL, "Not safe to call this method");
909
910 // The virtual spaces are always expanded by the
911 // commit granularity to enforce the following condition.
912 // Without this the is_available check will not work correctly.
913 assert(_virtual_space.committed_size() == _virtual_space.actual_committed_size(),
914 "The committed memory doesn't match the expanded memory.");
915
916 if (!is_available(chunk_word_size)) {
917 if (TraceMetadataChunkAllocation) {
918 gclog_or_tty->print("VirtualSpaceNode::take_from_committed() not available %d words ", chunk_word_size);
919 // Dump some information about the virtual space that is nearly full
920 print_on(gclog_or_tty);
921 }
922 return NULL;
923 }
924
925 // Take the space (bump top on the current virtual space).
926 inc_top(chunk_word_size);
927
928 // Initialize the chunk
929 Metachunk* result = ::new (chunk_limit) Metachunk(chunk_word_size, this);
930 return result;
931 }
932
933
934 // Expand the virtual space (commit more of the reserved space)
935 bool VirtualSpaceNode::expand_by(size_t min_words, size_t preferred_words) {
936 size_t min_bytes = min_words * BytesPerWord;
937 size_t preferred_bytes = preferred_words * BytesPerWord;
938
939 size_t uncommitted = virtual_space()->reserved_size() - virtual_space()->actual_committed_size();
940
941 if (uncommitted < min_bytes) {
942 return false;
943 }
944
945 size_t commit = MIN2(preferred_bytes, uncommitted);
946 bool result = virtual_space()->expand_by(commit, false);
947
948 assert(result, "Failed to commit memory");
949
950 return result;
951 }
952
953 Metachunk* VirtualSpaceNode::get_chunk_vs(size_t chunk_word_size) {
954 assert_lock_strong(SpaceManager::expand_lock());
955 Metachunk* result = take_from_committed(chunk_word_size);
956 if (result != NULL) {
957 inc_container_count();
958 }
959 return result;
960 }
961
962 bool VirtualSpaceNode::initialize() {
963
964 if (!_rs.is_reserved()) {
965 return false;
966 }
967
968 // These are necessary restriction to make sure that the virtual space always
969 // grows in steps of Metaspace::commit_alignment(). If both base and size are
970 // aligned only the middle alignment of the VirtualSpace is used.
971 assert_is_ptr_aligned(_rs.base(), Metaspace::commit_alignment());
972 assert_is_size_aligned(_rs.size(), Metaspace::commit_alignment());
973
974 // ReservedSpaces marked as special will have the entire memory
975 // pre-committed. Setting a committed size will make sure that
976 // committed_size and actual_committed_size agrees.
977 size_t pre_committed_size = _rs.special() ? _rs.size() : 0;
978
979 bool result = virtual_space()->initialize_with_granularity(_rs, pre_committed_size,
980 Metaspace::commit_alignment());
981 if (result) {
982 assert(virtual_space()->committed_size() == virtual_space()->actual_committed_size(),
983 "Checking that the pre-committed memory was registered by the VirtualSpace");
984
985 set_top((MetaWord*)virtual_space()->low());
986 set_reserved(MemRegion((HeapWord*)_rs.base(),
987 (HeapWord*)(_rs.base() + _rs.size())));
988
989 assert(reserved()->start() == (HeapWord*) _rs.base(),
990 err_msg("Reserved start was not set properly " PTR_FORMAT
991 " != " PTR_FORMAT, reserved()->start(), _rs.base()));
992 assert(reserved()->word_size() == _rs.size() / BytesPerWord,
993 err_msg("Reserved size was not set properly " SIZE_FORMAT
994 " != " SIZE_FORMAT, reserved()->word_size(),
995 _rs.size() / BytesPerWord));
996 }
997
998 return result;
999 }
1000
1001 void VirtualSpaceNode::print_on(outputStream* st) const {
1002 size_t used = used_words_in_vs();
1003 size_t capacity = capacity_words_in_vs();
1004 VirtualSpace* vs = virtual_space();
1005 st->print_cr(" space @ " PTR_FORMAT " " SIZE_FORMAT "K, %3d%% used "
1006 "[" PTR_FORMAT ", " PTR_FORMAT ", "
1007 PTR_FORMAT ", " PTR_FORMAT ")",
1008 vs, capacity / K,
1009 capacity == 0 ? 0 : used * 100 / capacity,
1010 bottom(), top(), end(),
1011 vs->high_boundary());
1012 }
1013
1014 #ifdef ASSERT
1015 void VirtualSpaceNode::mangle() {
1016 size_t word_size = capacity_words_in_vs();
1017 Copy::fill_to_words((HeapWord*) low(), word_size, 0xf1f1f1f1);
1018 }
1019 #endif // ASSERT
1020
1021 // VirtualSpaceList methods
1022 // Space allocated from the VirtualSpace
1023
1024 VirtualSpaceList::~VirtualSpaceList() {
1025 VirtualSpaceListIterator iter(virtual_space_list());
1026 while (iter.repeat()) {
1027 VirtualSpaceNode* vsl = iter.get_next();
1028 delete vsl;
1029 }
1030 }
1031
1032 void VirtualSpaceList::inc_reserved_words(size_t v) {
1033 assert_lock_strong(SpaceManager::expand_lock());
1034 _reserved_words = _reserved_words + v;
1035 }
1036 void VirtualSpaceList::dec_reserved_words(size_t v) {
1037 assert_lock_strong(SpaceManager::expand_lock());
1038 _reserved_words = _reserved_words - v;
1039 }
1040
1041 #define assert_committed_below_limit() \
1042 assert(MetaspaceAux::committed_bytes() <= MaxMetaspaceSize, \
1043 err_msg("Too much committed memory. Committed: " SIZE_FORMAT \
1044 " limit (MaxMetaspaceSize): " SIZE_FORMAT, \
1045 MetaspaceAux::committed_bytes(), MaxMetaspaceSize));
1046
1047 void VirtualSpaceList::inc_committed_words(size_t v) {
1048 assert_lock_strong(SpaceManager::expand_lock());
1049 _committed_words = _committed_words + v;
1050
1051 assert_committed_below_limit();
1052 }
1053 void VirtualSpaceList::dec_committed_words(size_t v) {
1054 assert_lock_strong(SpaceManager::expand_lock());
1055 _committed_words = _committed_words - v;
1056
1057 assert_committed_below_limit();
1058 }
1059
1060 void VirtualSpaceList::inc_virtual_space_count() {
1061 assert_lock_strong(SpaceManager::expand_lock());
1062 _virtual_space_count++;
1063 }
1064 void VirtualSpaceList::dec_virtual_space_count() {
1065 assert_lock_strong(SpaceManager::expand_lock());
1066 _virtual_space_count--;
1067 }
1068
1069 void ChunkManager::remove_chunk(Metachunk* chunk) {
1070 size_t word_size = chunk->word_size();
1071 ChunkIndex index = list_index(word_size);
1072 if (index != HumongousIndex) {
1073 free_chunks(index)->remove_chunk(chunk);
1074 } else {
1075 humongous_dictionary()->remove_chunk(chunk);
1076 }
1077
1078 // Chunk is being removed from the chunks free list.
1079 dec_free_chunks_total(chunk->word_size());
1080 }
1081
1082 // Walk the list of VirtualSpaceNodes and delete
1083 // nodes with a 0 container_count. Remove Metachunks in
1084 // the node from their respective freelists.
1085 void VirtualSpaceList::purge(ChunkManager* chunk_manager) {
1086 assert(SafepointSynchronize::is_at_safepoint(), "must be called at safepoint for contains to work");
1087 assert_lock_strong(SpaceManager::expand_lock());
1088 // Don't use a VirtualSpaceListIterator because this
1089 // list is being changed and a straightforward use of an iterator is not safe.
1090 VirtualSpaceNode* purged_vsl = NULL;
1091 VirtualSpaceNode* prev_vsl = virtual_space_list();
1092 VirtualSpaceNode* next_vsl = prev_vsl;
1093 while (next_vsl != NULL) {
1094 VirtualSpaceNode* vsl = next_vsl;
1095 next_vsl = vsl->next();
1096 // Don't free the current virtual space since it will likely
1097 // be needed soon.
1098 if (vsl->container_count() == 0 && vsl != current_virtual_space()) {
1099 // Unlink it from the list
1100 if (prev_vsl == vsl) {
1101 // This is the case of the current node being the first node.
1102 assert(vsl == virtual_space_list(), "Expected to be the first node");
1103 set_virtual_space_list(vsl->next());
1104 } else {
1105 prev_vsl->set_next(vsl->next());
1106 }
1107
1108 vsl->purge(chunk_manager);
1109 dec_reserved_words(vsl->reserved_words());
1110 dec_committed_words(vsl->committed_words());
1111 dec_virtual_space_count();
1112 purged_vsl = vsl;
1113 delete vsl;
1114 } else {
1115 prev_vsl = vsl;
1116 }
1117 }
1118 #ifdef ASSERT
1119 if (purged_vsl != NULL) {
1120 // List should be stable enough to use an iterator here.
1121 VirtualSpaceListIterator iter(virtual_space_list());
1122 while (iter.repeat()) {
1123 VirtualSpaceNode* vsl = iter.get_next();
1124 assert(vsl != purged_vsl, "Purge of vsl failed");
1125 }
1126 }
1127 #endif
1128 }
1129
1130
1131 // This function looks at the mmap regions in the metaspace without locking.
1132 // The chunks are added with store ordering and not deleted except for at
1133 // unloading time during a safepoint.
1134 bool VirtualSpaceList::contains(const void* ptr) {
1135 // List should be stable enough to use an iterator here because removing virtual
1136 // space nodes is only allowed at a safepoint.
1137 VirtualSpaceListIterator iter(virtual_space_list());
1138 while (iter.repeat()) {
1139 VirtualSpaceNode* vsn = iter.get_next();
1140 if (vsn->contains(ptr)) {
1141 return true;
1142 }
1143 }
1144 return false;
1145 }
1146
1147 void VirtualSpaceList::retire_current_virtual_space() {
1148 assert_lock_strong(SpaceManager::expand_lock());
1149
1150 VirtualSpaceNode* vsn = current_virtual_space();
1151
1152 ChunkManager* cm = is_class() ? Metaspace::chunk_manager_class() :
1153 Metaspace::chunk_manager_metadata();
1154
1155 vsn->retire(cm);
1156 }
1157
1158 void VirtualSpaceNode::retire(ChunkManager* chunk_manager) {
1159 for (int i = (int)MediumIndex; i >= (int)ZeroIndex; --i) {
1160 ChunkIndex index = (ChunkIndex)i;
1161 size_t chunk_size = chunk_manager->free_chunks(index)->size();
1162
1163 while (free_words_in_vs() >= chunk_size) {
1164 DEBUG_ONLY(verify_container_count();)
1165 Metachunk* chunk = get_chunk_vs(chunk_size);
1166 assert(chunk != NULL, "allocation should have been successful");
1167
1168 chunk_manager->return_chunks(index, chunk);
1169 chunk_manager->inc_free_chunks_total(chunk_size);
1170 DEBUG_ONLY(verify_container_count();)
1171 }
1172 }
1173 assert(free_words_in_vs() == 0, "should be empty now");
1174 }
1175
1176 VirtualSpaceList::VirtualSpaceList(size_t word_size) :
1177 _is_class(false),
1178 _virtual_space_list(NULL),
1179 _current_virtual_space(NULL),
1180 _reserved_words(0),
1181 _committed_words(0),
1182 _virtual_space_count(0) {
1183 MutexLockerEx cl(SpaceManager::expand_lock(),
1184 Mutex::_no_safepoint_check_flag);
1185 create_new_virtual_space(word_size);
1186 }
1187
1188 VirtualSpaceList::VirtualSpaceList(ReservedSpace rs) :
1189 _is_class(true),
1190 _virtual_space_list(NULL),
1191 _current_virtual_space(NULL),
1192 _reserved_words(0),
1193 _committed_words(0),
1194 _virtual_space_count(0) {
1195 MutexLockerEx cl(SpaceManager::expand_lock(),
1196 Mutex::_no_safepoint_check_flag);
1197 VirtualSpaceNode* class_entry = new VirtualSpaceNode(rs);
1198 bool succeeded = class_entry->initialize();
1199 if (succeeded) {
1200 link_vs(class_entry);
1201 }
1202 }
1203
1204 size_t VirtualSpaceList::free_bytes() {
1205 return virtual_space_list()->free_words_in_vs() * BytesPerWord;
1206 }
1207
1208 // Allocate another meta virtual space and add it to the list.
1209 bool VirtualSpaceList::create_new_virtual_space(size_t vs_word_size) {
1210 assert_lock_strong(SpaceManager::expand_lock());
1211
1212 if (is_class()) {
1213 assert(false, "We currently don't support more than one VirtualSpace for"
1214 " the compressed class space. The initialization of the"
1215 " CCS uses another code path and should not hit this path.");
1216 return false;
1217 }
1218
1219 if (vs_word_size == 0) {
1220 assert(false, "vs_word_size should always be at least _reserve_alignment large.");
1221 return false;
1222 }
1223
1224 // Reserve the space
1225 size_t vs_byte_size = vs_word_size * BytesPerWord;
1226 assert_is_size_aligned(vs_byte_size, Metaspace::reserve_alignment());
1227
1228 // Allocate the meta virtual space and initialize it.
1229 VirtualSpaceNode* new_entry = new VirtualSpaceNode(vs_byte_size);
1230 if (!new_entry->initialize()) {
1231 delete new_entry;
1232 return false;
1233 } else {
1234 assert(new_entry->reserved_words() == vs_word_size,
1235 "Reserved memory size differs from requested memory size");
1236 // ensure lock-free iteration sees fully initialized node
1237 OrderAccess::storestore();
1238 link_vs(new_entry);
1239 return true;
1240 }
1241 }
1242
1243 void VirtualSpaceList::link_vs(VirtualSpaceNode* new_entry) {
1244 if (virtual_space_list() == NULL) {
1245 set_virtual_space_list(new_entry);
1246 } else {
1247 current_virtual_space()->set_next(new_entry);
1248 }
1249 set_current_virtual_space(new_entry);
1250 inc_reserved_words(new_entry->reserved_words());
1251 inc_committed_words(new_entry->committed_words());
1252 inc_virtual_space_count();
1253 #ifdef ASSERT
1254 new_entry->mangle();
1255 #endif
1256 if (TraceMetavirtualspaceAllocation && Verbose) {
1257 VirtualSpaceNode* vsl = current_virtual_space();
1258 vsl->print_on(gclog_or_tty);
1259 }
1260 }
1261
1262 bool VirtualSpaceList::expand_node_by(VirtualSpaceNode* node,
1263 size_t min_words,
1264 size_t preferred_words) {
1265 size_t before = node->committed_words();
1266
1267 bool result = node->expand_by(min_words, preferred_words);
1268
1269 size_t after = node->committed_words();
1270
1271 // after and before can be the same if the memory was pre-committed.
1272 assert(after >= before, "Inconsistency");
1273 inc_committed_words(after - before);
1274
1275 return result;
1276 }
1277
1278 bool VirtualSpaceList::expand_by(size_t min_words, size_t preferred_words) {
1279 assert_is_size_aligned(min_words, Metaspace::commit_alignment_words());
1280 assert_is_size_aligned(preferred_words, Metaspace::commit_alignment_words());
1281 assert(min_words <= preferred_words, "Invalid arguments");
1282
1283 if (!MetaspaceGC::can_expand(min_words, this->is_class())) {
1284 return false;
1285 }
1286
1287 size_t allowed_expansion_words = MetaspaceGC::allowed_expansion();
1288 if (allowed_expansion_words < min_words) {
1289 return false;
1290 }
1291
1292 size_t max_expansion_words = MIN2(preferred_words, allowed_expansion_words);
1293
1294 // Commit more memory from the the current virtual space.
1295 bool vs_expanded = expand_node_by(current_virtual_space(),
1296 min_words,
1297 max_expansion_words);
1298 if (vs_expanded) {
1299 return true;
1300 }
1301 retire_current_virtual_space();
1302
1303 // Get another virtual space.
1304 size_t grow_vs_words = MAX2((size_t)VirtualSpaceSize, preferred_words);
1305 grow_vs_words = align_size_up(grow_vs_words, Metaspace::reserve_alignment_words());
1306
1307 if (create_new_virtual_space(grow_vs_words)) {
1308 if (current_virtual_space()->is_pre_committed()) {
1309 // The memory was pre-committed, so we are done here.
1310 assert(min_words <= current_virtual_space()->committed_words(),
1311 "The new VirtualSpace was pre-committed, so it"
1312 "should be large enough to fit the alloc request.");
1313 return true;
1314 }
1315
1316 return expand_node_by(current_virtual_space(),
1317 min_words,
1318 max_expansion_words);
1319 }
1320
1321 return false;
1322 }
1323
1324 Metachunk* VirtualSpaceList::get_new_chunk(size_t word_size,
1325 size_t grow_chunks_by_words,
1326 size_t medium_chunk_bunch) {
1327
1328 // Allocate a chunk out of the current virtual space.
1329 Metachunk* next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1330
1331 if (next != NULL) {
1332 return next;
1333 }
1334
1335 // The expand amount is currently only determined by the requested sizes
1336 // and not how much committed memory is left in the current virtual space.
1337
1338 size_t min_word_size = align_size_up(grow_chunks_by_words, Metaspace::commit_alignment_words());
1339 size_t preferred_word_size = align_size_up(medium_chunk_bunch, Metaspace::commit_alignment_words());
1340 if (min_word_size >= preferred_word_size) {
1341 // Can happen when humongous chunks are allocated.
1342 preferred_word_size = min_word_size;
1343 }
1344
1345 bool expanded = expand_by(min_word_size, preferred_word_size);
1346 if (expanded) {
1347 next = current_virtual_space()->get_chunk_vs(grow_chunks_by_words);
1348 assert(next != NULL, "The allocation was expected to succeed after the expansion");
1349 }
1350
1351 return next;
1352 }
1353
1354 void VirtualSpaceList::print_on(outputStream* st) const {
1355 if (TraceMetadataChunkAllocation && Verbose) {
1356 VirtualSpaceListIterator iter(virtual_space_list());
1357 while (iter.repeat()) {
1358 VirtualSpaceNode* node = iter.get_next();
1359 node->print_on(st);
1360 }
1361 }
1362 }
1363
1364 // MetaspaceGC methods
1365
1366 // VM_CollectForMetadataAllocation is the vm operation used to GC.
1367 // Within the VM operation after the GC the attempt to allocate the metadata
1368 // should succeed. If the GC did not free enough space for the metaspace
1369 // allocation, the HWM is increased so that another virtualspace will be
1370 // allocated for the metadata. With perm gen the increase in the perm
1371 // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The
1372 // metaspace policy uses those as the small and large steps for the HWM.
1373 //
1374 // After the GC the compute_new_size() for MetaspaceGC is called to
1375 // resize the capacity of the metaspaces. The current implementation
1376 // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used
1377 // to resize the Java heap by some GC's. New flags can be implemented
1378 // if really needed. MinMetaspaceFreeRatio is used to calculate how much
1379 // free space is desirable in the metaspace capacity to decide how much
1380 // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much
1381 // free space is desirable in the metaspace capacity before decreasing
1382 // the HWM.
1383
1384 // Calculate the amount to increase the high water mark (HWM).
1385 // Increase by a minimum amount (MinMetaspaceExpansion) so that
1386 // another expansion is not requested too soon. If that is not
1387 // enough to satisfy the allocation, increase by MaxMetaspaceExpansion.
1388 // If that is still not enough, expand by the size of the allocation
1389 // plus some.
1390 size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) {
1391 size_t min_delta = MinMetaspaceExpansion;
1392 size_t max_delta = MaxMetaspaceExpansion;
1393 size_t delta = align_size_up(bytes, Metaspace::commit_alignment());
1394
1395 if (delta <= min_delta) {
1396 delta = min_delta;
1397 } else if (delta <= max_delta) {
1398 // Don't want to hit the high water mark on the next
1399 // allocation so make the delta greater than just enough
1400 // for this allocation.
1401 delta = max_delta;
1402 } else {
1403 // This allocation is large but the next ones are probably not
1404 // so increase by the minimum.
1405 delta = delta + min_delta;
1406 }
1407
1408 assert_is_size_aligned(delta, Metaspace::commit_alignment());
1409
1410 return delta;
1411 }
1412
1413 size_t MetaspaceGC::capacity_until_GC() {
1414 size_t value = (size_t)OrderAccess::load_ptr_acquire(&_capacity_until_GC);
1415 assert(value >= MetaspaceSize, "Not initialized properly?");
1416 return value;
1417 }
1418
1419 bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) {
1420 assert_is_size_aligned(v, Metaspace::commit_alignment());
1421
1422 size_t capacity_until_GC = (size_t) _capacity_until_GC;
1423 size_t new_value = capacity_until_GC + v;
1424
1425 if (new_value < capacity_until_GC) {
1426 // The addition wrapped around, set new_value to aligned max value.
1427 new_value = align_size_down(max_uintx, Metaspace::commit_alignment());
1428 }
1429
1430 intptr_t expected = (intptr_t) capacity_until_GC;
1431 intptr_t actual = Atomic::cmpxchg_ptr((intptr_t) new_value, &_capacity_until_GC, expected);
1432
1433 if (expected != actual) {
1434 return false;
1435 }
1436
1437 if (new_cap_until_GC != NULL) {
1438 *new_cap_until_GC = new_value;
1439 }
1440 if (old_cap_until_GC != NULL) {
1441 *old_cap_until_GC = capacity_until_GC;
1442 }
1443 return true;
1444 }
1445
1446 size_t MetaspaceGC::dec_capacity_until_GC(size_t v) {
1447 assert_is_size_aligned(v, Metaspace::commit_alignment());
1448
1449 return (size_t)Atomic::add_ptr(-(intptr_t)v, &_capacity_until_GC);
1450 }
1451
1452 void MetaspaceGC::initialize() {
1453 // Set the high-water mark to MaxMetapaceSize during VM initializaton since
1454 // we can't do a GC during initialization.
1455 _capacity_until_GC = MaxMetaspaceSize;
1456 }
1457
1458 void MetaspaceGC::post_initialize() {
1459 // Reset the high-water mark once the VM initialization is done.
1460 _capacity_until_GC = MAX2(MetaspaceAux::committed_bytes(), MetaspaceSize);
1461 }
1462
1463 bool MetaspaceGC::can_expand(size_t word_size, bool is_class) {
1464 // Check if the compressed class space is full.
1465 if (is_class && Metaspace::using_class_space()) {
1466 size_t class_committed = MetaspaceAux::committed_bytes(Metaspace::ClassType);
1467 if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) {
1468 return false;
1469 }
1470 }
1471
1472 // Check if the user has imposed a limit on the metaspace memory.
1473 size_t committed_bytes = MetaspaceAux::committed_bytes();
1474 if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) {
1475 return false;
1476 }
1477
1478 return true;
1479 }
1480
1481 size_t MetaspaceGC::allowed_expansion() {
1482 size_t committed_bytes = MetaspaceAux::committed_bytes();
1483 size_t capacity_until_gc = capacity_until_GC();
1484
1485 assert(capacity_until_gc >= committed_bytes,
1486 err_msg("capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,
1487 capacity_until_gc, committed_bytes));
1488
1489 size_t left_until_max = MaxMetaspaceSize - committed_bytes;
1490 size_t left_until_GC = capacity_until_gc - committed_bytes;
1491 size_t left_to_commit = MIN2(left_until_GC, left_until_max);
1492
1493 return left_to_commit / BytesPerWord;
1494 }
1495
1496 void MetaspaceGC::compute_new_size() {
1497 assert(_shrink_factor <= 100, "invalid shrink factor");
1498 uint current_shrink_factor = _shrink_factor;
1499 _shrink_factor = 0;
1500
1501 // Using committed_bytes() for used_after_gc is an overestimation, since the
1502 // chunk free lists are included in committed_bytes() and the memory in an
1503 // un-fragmented chunk free list is available for future allocations.
1504 // However, if the chunk free lists becomes fragmented, then the memory may
1505 // not be available for future allocations and the memory is therefore "in use".
1506 // Including the chunk free lists in the definition of "in use" is therefore
1507 // necessary. Not including the chunk free lists can cause capacity_until_GC to
1508 // shrink below committed_bytes() and this has caused serious bugs in the past.
1509 const size_t used_after_gc = MetaspaceAux::committed_bytes();
1510 const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC();
1511
1512 const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0;
1513 const double maximum_used_percentage = 1.0 - minimum_free_percentage;
1514
1515 const double min_tmp = used_after_gc / maximum_used_percentage;
1516 size_t minimum_desired_capacity =
1517 (size_t)MIN2(min_tmp, double(max_uintx));
1518 // Don't shrink less than the initial generation size
1519 minimum_desired_capacity = MAX2(minimum_desired_capacity,
1520 MetaspaceSize);
1521
1522 if (PrintGCDetails && Verbose) {
1523 gclog_or_tty->print_cr("\nMetaspaceGC::compute_new_size: ");
1524 gclog_or_tty->print_cr(" "
1525 " minimum_free_percentage: %6.2f"
1526 " maximum_used_percentage: %6.2f",
1527 minimum_free_percentage,
1528 maximum_used_percentage);
1529 gclog_or_tty->print_cr(" "
1530 " used_after_gc : %6.1fKB",
1531 used_after_gc / (double) K);
1532 }
1533
1534
1535 size_t shrink_bytes = 0;
1536 if (capacity_until_GC < minimum_desired_capacity) {
1537 // If we have less capacity below the metaspace HWM, then
1538 // increment the HWM.
1539 size_t expand_bytes = minimum_desired_capacity - capacity_until_GC;
1540 expand_bytes = align_size_up(expand_bytes, Metaspace::commit_alignment());
1541 // Don't expand unless it's significant
1542 if (expand_bytes >= MinMetaspaceExpansion) {
1543 size_t new_capacity_until_GC = 0;
1544 bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC);
1545 assert(succeeded, "Should always succesfully increment HWM when at safepoint");
1546
1547 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
1548 new_capacity_until_GC,
1549 MetaspaceGCThresholdUpdater::ComputeNewSize);
1550 if (PrintGCDetails && Verbose) {
1551 gclog_or_tty->print_cr(" expanding:"
1552 " minimum_desired_capacity: %6.1fKB"
1553 " expand_bytes: %6.1fKB"
1554 " MinMetaspaceExpansion: %6.1fKB"
1555 " new metaspace HWM: %6.1fKB",
1556 minimum_desired_capacity / (double) K,
1557 expand_bytes / (double) K,
1558 MinMetaspaceExpansion / (double) K,
1559 new_capacity_until_GC / (double) K);
1560 }
1561 }
1562 return;
1563 }
1564
1565 // No expansion, now see if we want to shrink
1566 // We would never want to shrink more than this
1567 assert(capacity_until_GC >= minimum_desired_capacity,
1568 err_msg(SIZE_FORMAT " >= " SIZE_FORMAT,
1569 capacity_until_GC, minimum_desired_capacity));
1570 size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity;
1571
1572 // Should shrinking be considered?
1573 if (MaxMetaspaceFreeRatio < 100) {
1574 const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0;
1575 const double minimum_used_percentage = 1.0 - maximum_free_percentage;
1576 const double max_tmp = used_after_gc / minimum_used_percentage;
1577 size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx));
1578 maximum_desired_capacity = MAX2(maximum_desired_capacity,
1579 MetaspaceSize);
1580 if (PrintGCDetails && Verbose) {
1581 gclog_or_tty->print_cr(" "
1582 " maximum_free_percentage: %6.2f"
1583 " minimum_used_percentage: %6.2f",
1584 maximum_free_percentage,
1585 minimum_used_percentage);
1586 gclog_or_tty->print_cr(" "
1587 " minimum_desired_capacity: %6.1fKB"
1588 " maximum_desired_capacity: %6.1fKB",
1589 minimum_desired_capacity / (double) K,
1590 maximum_desired_capacity / (double) K);
1591 }
1592
1593 assert(minimum_desired_capacity <= maximum_desired_capacity,
1594 "sanity check");
1595
1596 if (capacity_until_GC > maximum_desired_capacity) {
1597 // Capacity too large, compute shrinking size
1598 shrink_bytes = capacity_until_GC - maximum_desired_capacity;
1599 // We don't want shrink all the way back to initSize if people call
1600 // System.gc(), because some programs do that between "phases" and then
1601 // we'd just have to grow the heap up again for the next phase. So we
1602 // damp the shrinking: 0% on the first call, 10% on the second call, 40%
1603 // on the third call, and 100% by the fourth call. But if we recompute
1604 // size without shrinking, it goes back to 0%.
1605 shrink_bytes = shrink_bytes / 100 * current_shrink_factor;
1606
1607 shrink_bytes = align_size_down(shrink_bytes, Metaspace::commit_alignment());
1608
1609 assert(shrink_bytes <= max_shrink_bytes,
1610 err_msg("invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,
1611 shrink_bytes, max_shrink_bytes));
1612 if (current_shrink_factor == 0) {
1613 _shrink_factor = 10;
1614 } else {
1615 _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100);
1616 }
1617 if (PrintGCDetails && Verbose) {
1618 gclog_or_tty->print_cr(" "
1619 " shrinking:"
1620 " initSize: %.1fK"
1621 " maximum_desired_capacity: %.1fK",
1622 MetaspaceSize / (double) K,
1623 maximum_desired_capacity / (double) K);
1624 gclog_or_tty->print_cr(" "
1625 " shrink_bytes: %.1fK"
1626 " current_shrink_factor: %d"
1627 " new shrink factor: %d"
1628 " MinMetaspaceExpansion: %.1fK",
1629 shrink_bytes / (double) K,
1630 current_shrink_factor,
1631 _shrink_factor,
1632 MinMetaspaceExpansion / (double) K);
1633 }
1634 }
1635 }
1636
1637 // Don't shrink unless it's significant
1638 if (shrink_bytes >= MinMetaspaceExpansion &&
1639 ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) {
1640 size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes);
1641 Metaspace::tracer()->report_gc_threshold(capacity_until_GC,
1642 new_capacity_until_GC,
1643 MetaspaceGCThresholdUpdater::ComputeNewSize);
1644 }
1645 }
1646
1647 // Metadebug methods
1648
1649 void Metadebug::init_allocation_fail_alot_count() {
1650 if (MetadataAllocationFailALot) {
1651 _allocation_fail_alot_count =
1652 1+(long)((double)MetadataAllocationFailALotInterval*os::random()/(max_jint+1.0));
1653 }
1654 }
1655
1656 #ifdef ASSERT
1657 bool Metadebug::test_metadata_failure() {
1658 if (MetadataAllocationFailALot &&
1659 Threads::is_vm_complete()) {
1660 if (_allocation_fail_alot_count > 0) {
1661 _allocation_fail_alot_count--;
1662 } else {
1663 if (TraceMetadataChunkAllocation && Verbose) {
1664 gclog_or_tty->print_cr("Metadata allocation failing for "
1665 "MetadataAllocationFailALot");
1666 }
1667 init_allocation_fail_alot_count();
1668 return true;
1669 }
1670 }
1671 return false;
1672 }
1673 #endif
1674
1675 // ChunkManager methods
1676
1677 size_t ChunkManager::free_chunks_total_words() {
1678 return _free_chunks_total;
1679 }
1680
1681 size_t ChunkManager::free_chunks_total_bytes() {
1682 return free_chunks_total_words() * BytesPerWord;
1683 }
1684
1685 size_t ChunkManager::free_chunks_count() {
1686 #ifdef ASSERT
1687 if (!UseConcMarkSweepGC && !SpaceManager::expand_lock()->is_locked()) {
1688 MutexLockerEx cl(SpaceManager::expand_lock(),
1689 Mutex::_no_safepoint_check_flag);
1690 // This lock is only needed in debug because the verification
1691 // of the _free_chunks_totals walks the list of free chunks
1692 slow_locked_verify_free_chunks_count();
1693 }
1694 #endif
1695 return _free_chunks_count;
1696 }
1697
1698 void ChunkManager::locked_verify_free_chunks_total() {
1699 assert_lock_strong(SpaceManager::expand_lock());
1700 assert(sum_free_chunks() == _free_chunks_total,
1701 err_msg("_free_chunks_total " SIZE_FORMAT " is not the"
1702 " same as sum " SIZE_FORMAT, _free_chunks_total,
1703 sum_free_chunks()));
1704 }
1705
1706 void ChunkManager::verify_free_chunks_total() {
1707 MutexLockerEx cl(SpaceManager::expand_lock(),
1708 Mutex::_no_safepoint_check_flag);
1709 locked_verify_free_chunks_total();
1710 }
1711
1712 void ChunkManager::locked_verify_free_chunks_count() {
1713 assert_lock_strong(SpaceManager::expand_lock());
1714 assert(sum_free_chunks_count() == _free_chunks_count,
1715 err_msg("_free_chunks_count " SIZE_FORMAT " is not the"
1716 " same as sum " SIZE_FORMAT, _free_chunks_count,
1717 sum_free_chunks_count()));
1718 }
1719
1720 void ChunkManager::verify_free_chunks_count() {
1721 #ifdef ASSERT
1722 MutexLockerEx cl(SpaceManager::expand_lock(),
1723 Mutex::_no_safepoint_check_flag);
1724 locked_verify_free_chunks_count();
1725 #endif
1726 }
1727
1728 void ChunkManager::verify() {
1729 MutexLockerEx cl(SpaceManager::expand_lock(),
1730 Mutex::_no_safepoint_check_flag);
1731 locked_verify();
1732 }
1733
1734 void ChunkManager::locked_verify() {
1735 locked_verify_free_chunks_count();
1736 locked_verify_free_chunks_total();
1737 }
1738
1739 void ChunkManager::locked_print_free_chunks(outputStream* st) {
1740 assert_lock_strong(SpaceManager::expand_lock());
1741 st->print_cr("Free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1742 _free_chunks_total, _free_chunks_count);
1743 }
1744
1745 void ChunkManager::locked_print_sum_free_chunks(outputStream* st) {
1746 assert_lock_strong(SpaceManager::expand_lock());
1747 st->print_cr("Sum free chunk total " SIZE_FORMAT " count " SIZE_FORMAT,
1748 sum_free_chunks(), sum_free_chunks_count());
1749 }
1750 ChunkList* ChunkManager::free_chunks(ChunkIndex index) {
1751 return &_free_chunks[index];
1752 }
1753
1754 // These methods that sum the free chunk lists are used in printing
1755 // methods that are used in product builds.
1756 size_t ChunkManager::sum_free_chunks() {
1757 assert_lock_strong(SpaceManager::expand_lock());
1758 size_t result = 0;
1759 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1760 ChunkList* list = free_chunks(i);
1761
1762 if (list == NULL) {
1763 continue;
1764 }
1765
1766 result = result + list->count() * list->size();
1767 }
1768 result = result + humongous_dictionary()->total_size();
1769 return result;
1770 }
1771
1772 size_t ChunkManager::sum_free_chunks_count() {
1773 assert_lock_strong(SpaceManager::expand_lock());
1774 size_t count = 0;
1775 for (ChunkIndex i = ZeroIndex; i < NumberOfFreeLists; i = next_chunk_index(i)) {
1776 ChunkList* list = free_chunks(i);
1777 if (list == NULL) {
1778 continue;
1779 }
1780 count = count + list->count();
1781 }
1782 count = count + humongous_dictionary()->total_free_blocks();
1783 return count;
1784 }
1785
1786 ChunkList* ChunkManager::find_free_chunks_list(size_t word_size) {
1787 ChunkIndex index = list_index(word_size);
1788 assert(index < HumongousIndex, "No humongous list");
1789 return free_chunks(index);
1790 }
1791
1792 Metachunk* ChunkManager::free_chunks_get(size_t word_size) {
1793 assert_lock_strong(SpaceManager::expand_lock());
1794
1795 slow_locked_verify();
1796
1797 Metachunk* chunk = NULL;
1798 if (list_index(word_size) != HumongousIndex) {
1799 ChunkList* free_list = find_free_chunks_list(word_size);
1800 assert(free_list != NULL, "Sanity check");
1801
1802 chunk = free_list->head();
1803
1804 if (chunk == NULL) {
1805 return NULL;
1806 }
1807
1808 // Remove the chunk as the head of the list.
1809 free_list->remove_chunk(chunk);
1810
1811 if (TraceMetadataChunkAllocation && Verbose) {
1812 gclog_or_tty->print_cr("ChunkManager::free_chunks_get: free_list "
1813 PTR_FORMAT " head " PTR_FORMAT " size " SIZE_FORMAT,
1814 free_list, chunk, chunk->word_size());
1815 }
1816 } else {
1817 chunk = humongous_dictionary()->get_chunk(
1818 word_size,
1819 FreeBlockDictionary<Metachunk>::atLeast);
1820
1821 if (chunk == NULL) {
1822 return NULL;
1823 }
1824
1825 if (TraceMetadataHumongousAllocation) {
1826 size_t waste = chunk->word_size() - word_size;
1827 gclog_or_tty->print_cr("Free list allocate humongous chunk size "
1828 SIZE_FORMAT " for requested size " SIZE_FORMAT
1829 " waste " SIZE_FORMAT,
1830 chunk->word_size(), word_size, waste);
1831 }
1832 }
1833
1834 // Chunk is being removed from the chunks free list.
1835 dec_free_chunks_total(chunk->word_size());
1836
1837 // Remove it from the links to this freelist
1838 chunk->set_next(NULL);
1839 chunk->set_prev(NULL);
1840 #ifdef ASSERT
1841 // Chunk is no longer on any freelist. Setting to false make container_count_slow()
1842 // work.
1843 chunk->set_is_tagged_free(false);
1844 #endif
1845 chunk->container()->inc_container_count();
1846
1847 slow_locked_verify();
1848 return chunk;
1849 }
1850
1851 Metachunk* ChunkManager::chunk_freelist_allocate(size_t word_size) {
1852 assert_lock_strong(SpaceManager::expand_lock());
1853 slow_locked_verify();
1854
1855 // Take from the beginning of the list
1856 Metachunk* chunk = free_chunks_get(word_size);
1857 if (chunk == NULL) {
1858 return NULL;
1859 }
1860
1861 assert((word_size <= chunk->word_size()) ||
1862 list_index(chunk->word_size() == HumongousIndex),
1863 "Non-humongous variable sized chunk");
1864 if (TraceMetadataChunkAllocation) {
1865 size_t list_count;
1866 if (list_index(word_size) < HumongousIndex) {
1867 ChunkList* list = find_free_chunks_list(word_size);
1868 list_count = list->count();
1869 } else {
1870 list_count = humongous_dictionary()->total_count();
1871 }
1872 gclog_or_tty->print("ChunkManager::chunk_freelist_allocate: " PTR_FORMAT " chunk "
1873 PTR_FORMAT " size " SIZE_FORMAT " count " SIZE_FORMAT " ",
1874 this, chunk, chunk->word_size(), list_count);
1875 locked_print_free_chunks(gclog_or_tty);
1876 }
1877
1878 return chunk;
1879 }
1880
1881 void ChunkManager::print_on(outputStream* out) const {
1882 if (PrintFLSStatistics != 0) {
1883 const_cast<ChunkManager *>(this)->humongous_dictionary()->report_statistics();
1884 }
1885 }
1886
1887 // SpaceManager methods
1888
1889 void SpaceManager::get_initial_chunk_sizes(Metaspace::MetaspaceType type,
1890 size_t* chunk_word_size,
1891 size_t* class_chunk_word_size) {
1892 switch (type) {
1893 case Metaspace::BootMetaspaceType:
1894 *chunk_word_size = Metaspace::first_chunk_word_size();
1895 *class_chunk_word_size = Metaspace::first_class_chunk_word_size();
1896 break;
1897 case Metaspace::ROMetaspaceType:
1898 *chunk_word_size = SharedReadOnlySize / wordSize;
1899 *class_chunk_word_size = ClassSpecializedChunk;
1900 break;
1901 case Metaspace::ReadWriteMetaspaceType:
1902 *chunk_word_size = SharedReadWriteSize / wordSize;
1903 *class_chunk_word_size = ClassSpecializedChunk;
1904 break;
1905 case Metaspace::AnonymousMetaspaceType:
1906 case Metaspace::ReflectionMetaspaceType:
1907 *chunk_word_size = SpecializedChunk;
1908 *class_chunk_word_size = ClassSpecializedChunk;
1909 break;
1910 default:
1911 *chunk_word_size = SmallChunk;
1912 *class_chunk_word_size = ClassSmallChunk;
1913 break;
1914 }
1915 assert(*chunk_word_size != 0 && *class_chunk_word_size != 0,
1916 err_msg("Initial chunks sizes bad: data " SIZE_FORMAT
1917 " class " SIZE_FORMAT,
1918 *chunk_word_size, *class_chunk_word_size));
1919 }
1920
1921 size_t SpaceManager::sum_free_in_chunks_in_use() const {
1922 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1923 size_t free = 0;
1924 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1925 Metachunk* chunk = chunks_in_use(i);
1926 while (chunk != NULL) {
1927 free += chunk->free_word_size();
1928 chunk = chunk->next();
1929 }
1930 }
1931 return free;
1932 }
1933
1934 size_t SpaceManager::sum_waste_in_chunks_in_use() const {
1935 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1936 size_t result = 0;
1937 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1938 result += sum_waste_in_chunks_in_use(i);
1939 }
1940
1941 return result;
1942 }
1943
1944 size_t SpaceManager::sum_waste_in_chunks_in_use(ChunkIndex index) const {
1945 size_t result = 0;
1946 Metachunk* chunk = chunks_in_use(index);
1947 // Count the free space in all the chunk but not the
1948 // current chunk from which allocations are still being done.
1949 while (chunk != NULL) {
1950 if (chunk != current_chunk()) {
1951 result += chunk->free_word_size();
1952 }
1953 chunk = chunk->next();
1954 }
1955 return result;
1956 }
1957
1958 size_t SpaceManager::sum_capacity_in_chunks_in_use() const {
1959 // For CMS use "allocated_chunks_words()" which does not need the
1960 // Metaspace lock. For the other collectors sum over the
1961 // lists. Use both methods as a check that "allocated_chunks_words()"
1962 // is correct. That is, sum_capacity_in_chunks() is too expensive
1963 // to use in the product and allocated_chunks_words() should be used
1964 // but allow for checking that allocated_chunks_words() returns the same
1965 // value as sum_capacity_in_chunks_in_use() which is the definitive
1966 // answer.
1967 if (UseConcMarkSweepGC) {
1968 return allocated_chunks_words();
1969 } else {
1970 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
1971 size_t sum = 0;
1972 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1973 Metachunk* chunk = chunks_in_use(i);
1974 while (chunk != NULL) {
1975 sum += chunk->word_size();
1976 chunk = chunk->next();
1977 }
1978 }
1979 return sum;
1980 }
1981 }
1982
1983 size_t SpaceManager::sum_count_in_chunks_in_use() {
1984 size_t count = 0;
1985 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
1986 count = count + sum_count_in_chunks_in_use(i);
1987 }
1988
1989 return count;
1990 }
1991
1992 size_t SpaceManager::sum_count_in_chunks_in_use(ChunkIndex i) {
1993 size_t count = 0;
1994 Metachunk* chunk = chunks_in_use(i);
1995 while (chunk != NULL) {
1996 count++;
1997 chunk = chunk->next();
1998 }
1999 return count;
2000 }
2001
2002
2003 size_t SpaceManager::sum_used_in_chunks_in_use() const {
2004 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
2005 size_t used = 0;
2006 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2007 Metachunk* chunk = chunks_in_use(i);
2008 while (chunk != NULL) {
2009 used += chunk->used_word_size();
2010 chunk = chunk->next();
2011 }
2012 }
2013 return used;
2014 }
2015
2016 void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
2017
2018 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2019 Metachunk* chunk = chunks_in_use(i);
2020 st->print("SpaceManager: %s " PTR_FORMAT,
2021 chunk_size_name(i), chunk);
2022 if (chunk != NULL) {
2023 st->print_cr(" free " SIZE_FORMAT,
2024 chunk->free_word_size());
2025 } else {
2026 st->cr();
2027 }
2028 }
2029
2030 chunk_manager()->locked_print_free_chunks(st);
2031 chunk_manager()->locked_print_sum_free_chunks(st);
2032 }
2033
2034 size_t SpaceManager::calc_chunk_size(size_t word_size) {
2035
2036 // Decide between a small chunk and a medium chunk. Up to
2037 // _small_chunk_limit small chunks can be allocated but
2038 // once a medium chunk has been allocated, no more small
2039 // chunks will be allocated.
2040 size_t chunk_word_size;
2041 if (chunks_in_use(MediumIndex) == NULL &&
2042 sum_count_in_chunks_in_use(SmallIndex) < _small_chunk_limit) {
2043 chunk_word_size = (size_t) small_chunk_size();
2044 if (word_size + Metachunk::overhead() > small_chunk_size()) {
2045 chunk_word_size = medium_chunk_size();
2046 }
2047 } else {
2048 chunk_word_size = medium_chunk_size();
2049 }
2050
2051 // Might still need a humongous chunk. Enforce
2052 // humongous allocations sizes to be aligned up to
2053 // the smallest chunk size.
2054 size_t if_humongous_sized_chunk =
2055 align_size_up(word_size + Metachunk::overhead(),
2056 smallest_chunk_size());
2057 chunk_word_size =
2058 MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
2059
2060 assert(!SpaceManager::is_humongous(word_size) ||
2061 chunk_word_size == if_humongous_sized_chunk,
2062 err_msg("Size calculation is wrong, word_size " SIZE_FORMAT
2063 " chunk_word_size " SIZE_FORMAT,
2064 word_size, chunk_word_size));
2065 if (TraceMetadataHumongousAllocation &&
2066 SpaceManager::is_humongous(word_size)) {
2067 gclog_or_tty->print_cr("Metadata humongous allocation:");
2068 gclog_or_tty->print_cr(" word_size " PTR_FORMAT, word_size);
2069 gclog_or_tty->print_cr(" chunk_word_size " PTR_FORMAT,
2070 chunk_word_size);
2071 gclog_or_tty->print_cr(" chunk overhead " PTR_FORMAT,
2072 Metachunk::overhead());
2073 }
2074 return chunk_word_size;
2075 }
2076
2077 void SpaceManager::track_metaspace_memory_usage() {
2078 if (is_init_completed()) {
2079 if (is_class()) {
2080 MemoryService::track_compressed_class_memory_usage();
2081 }
2082 MemoryService::track_metaspace_memory_usage();
2083 }
2084 }
2085
2086 MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
2087 assert(vs_list()->current_virtual_space() != NULL,
2088 "Should have been set");
2089 assert(current_chunk() == NULL ||
2090 current_chunk()->allocate(word_size) == NULL,
2091 "Don't need to expand");
2092 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
2093
2094 if (TraceMetadataChunkAllocation && Verbose) {
2095 size_t words_left = 0;
2096 size_t words_used = 0;
2097 if (current_chunk() != NULL) {
2098 words_left = current_chunk()->free_word_size();
2099 words_used = current_chunk()->used_word_size();
2100 }
2101 gclog_or_tty->print_cr("SpaceManager::grow_and_allocate for " SIZE_FORMAT
2102 " words " SIZE_FORMAT " words used " SIZE_FORMAT
2103 " words left",
2104 word_size, words_used, words_left);
2105 }
2106
2107 // Get another chunk out of the virtual space
2108 size_t grow_chunks_by_words = calc_chunk_size(word_size);
2109 Metachunk* next = get_new_chunk(word_size, grow_chunks_by_words);
2110
2111 MetaWord* mem = NULL;
2112
2113 // If a chunk was available, add it to the in-use chunk list
2114 // and do an allocation from it.
2115 if (next != NULL) {
2116 // Add to this manager's list of chunks in use.
2117 add_chunk(next, false);
2118 mem = next->allocate(word_size);
2119 }
2120
2121 // Track metaspace memory usage statistic.
2122 track_metaspace_memory_usage();
2123
2124 return mem;
2125 }
2126
2127 void SpaceManager::print_on(outputStream* st) const {
2128
2129 for (ChunkIndex i = ZeroIndex;
2130 i < NumberOfInUseLists ;
2131 i = next_chunk_index(i) ) {
2132 st->print_cr(" chunks_in_use " PTR_FORMAT " chunk size " PTR_FORMAT,
2133 chunks_in_use(i),
2134 chunks_in_use(i) == NULL ? 0 : chunks_in_use(i)->word_size());
2135 }
2136 st->print_cr(" waste: Small " SIZE_FORMAT " Medium " SIZE_FORMAT
2137 " Humongous " SIZE_FORMAT,
2138 sum_waste_in_chunks_in_use(SmallIndex),
2139 sum_waste_in_chunks_in_use(MediumIndex),
2140 sum_waste_in_chunks_in_use(HumongousIndex));
2141 // block free lists
2142 if (block_freelists() != NULL) {
2143 st->print_cr("total in block free lists " SIZE_FORMAT,
2144 block_freelists()->total_size());
2145 }
2146 }
2147
2148 SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
2149 Mutex* lock) :
2150 _mdtype(mdtype),
2151 _allocated_blocks_words(0),
2152 _allocated_chunks_words(0),
2153 _allocated_chunks_count(0),
2154 _lock(lock)
2155 {
2156 initialize();
2157 }
2158
2159 void SpaceManager::inc_size_metrics(size_t words) {
2160 assert_lock_strong(SpaceManager::expand_lock());
2161 // Total of allocated Metachunks and allocated Metachunks count
2162 // for each SpaceManager
2163 _allocated_chunks_words = _allocated_chunks_words + words;
2164 _allocated_chunks_count++;
2165 // Global total of capacity in allocated Metachunks
2166 MetaspaceAux::inc_capacity(mdtype(), words);
2167 // Global total of allocated Metablocks.
2168 // used_words_slow() includes the overhead in each
2169 // Metachunk so include it in the used when the
2170 // Metachunk is first added (so only added once per
2171 // Metachunk).
2172 MetaspaceAux::inc_used(mdtype(), Metachunk::overhead());
2173 }
2174
2175 void SpaceManager::inc_used_metrics(size_t words) {
2176 // Add to the per SpaceManager total
2177 Atomic::add_ptr(words, &_allocated_blocks_words);
2178 // Add to the global total
2179 MetaspaceAux::inc_used(mdtype(), words);
2180 }
2181
2182 void SpaceManager::dec_total_from_size_metrics() {
2183 MetaspaceAux::dec_capacity(mdtype(), allocated_chunks_words());
2184 MetaspaceAux::dec_used(mdtype(), allocated_blocks_words());
2185 // Also deduct the overhead per Metachunk
2186 MetaspaceAux::dec_used(mdtype(), allocated_chunks_count() * Metachunk::overhead());
2187 }
2188
2189 void SpaceManager::initialize() {
2190 Metadebug::init_allocation_fail_alot_count();
2191 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2192 _chunks_in_use[i] = NULL;
2193 }
2194 _current_chunk = NULL;
2195 if (TraceMetadataChunkAllocation && Verbose) {
2196 gclog_or_tty->print_cr("SpaceManager(): " PTR_FORMAT, this);
2197 }
2198 }
2199
2200 void ChunkManager::return_chunks(ChunkIndex index, Metachunk* chunks) {
2201 if (chunks == NULL) {
2202 return;
2203 }
2204 ChunkList* list = free_chunks(index);
2205 assert(list->size() == chunks->word_size(), "Mismatch in chunk sizes");
2206 assert_lock_strong(SpaceManager::expand_lock());
2207 Metachunk* cur = chunks;
2208
2209 // This returns chunks one at a time. If a new
2210 // class List can be created that is a base class
2211 // of FreeList then something like FreeList::prepend()
2212 // can be used in place of this loop
2213 while (cur != NULL) {
2214 assert(cur->container() != NULL, "Container should have been set");
2215 cur->container()->dec_container_count();
2216 // Capture the next link before it is changed
2217 // by the call to return_chunk_at_head();
2218 Metachunk* next = cur->next();
2219 DEBUG_ONLY(cur->set_is_tagged_free(true);)
2220 list->return_chunk_at_head(cur);
2221 cur = next;
2222 }
2223 }
2224
2225 SpaceManager::~SpaceManager() {
2226 // This call this->_lock which can't be done while holding expand_lock()
2227 assert(sum_capacity_in_chunks_in_use() == allocated_chunks_words(),
2228 err_msg("sum_capacity_in_chunks_in_use() " SIZE_FORMAT
2229 " allocated_chunks_words() " SIZE_FORMAT,
2230 sum_capacity_in_chunks_in_use(), allocated_chunks_words()));
2231
2232 MutexLockerEx fcl(SpaceManager::expand_lock(),
2233 Mutex::_no_safepoint_check_flag);
2234
2235 chunk_manager()->slow_locked_verify();
2236
2237 dec_total_from_size_metrics();
2238
2239 if (TraceMetadataChunkAllocation && Verbose) {
2240 gclog_or_tty->print_cr("~SpaceManager(): " PTR_FORMAT, this);
2241 locked_print_chunks_in_use_on(gclog_or_tty);
2242 }
2243
2244 // Do not mangle freed Metachunks. The chunk size inside Metachunks
2245 // is during the freeing of a VirtualSpaceNodes.
2246
2247 // Have to update before the chunks_in_use lists are emptied
2248 // below.
2249 chunk_manager()->inc_free_chunks_total(allocated_chunks_words(),
2250 sum_count_in_chunks_in_use());
2251
2252 // Add all the chunks in use by this space manager
2253 // to the global list of free chunks.
2254
2255 // Follow each list of chunks-in-use and add them to the
2256 // free lists. Each list is NULL terminated.
2257
2258 for (ChunkIndex i = ZeroIndex; i < HumongousIndex; i = next_chunk_index(i)) {
2259 if (TraceMetadataChunkAllocation && Verbose) {
2260 gclog_or_tty->print_cr("returned %d %s chunks to freelist",
2261 sum_count_in_chunks_in_use(i),
2262 chunk_size_name(i));
2263 }
2264 Metachunk* chunks = chunks_in_use(i);
2265 chunk_manager()->return_chunks(i, chunks);
2266 set_chunks_in_use(i, NULL);
2267 if (TraceMetadataChunkAllocation && Verbose) {
2268 gclog_or_tty->print_cr("updated freelist count %d %s",
2269 chunk_manager()->free_chunks(i)->count(),
2270 chunk_size_name(i));
2271 }
2272 assert(i != HumongousIndex, "Humongous chunks are handled explicitly later");
2273 }
2274
2275 // The medium chunk case may be optimized by passing the head and
2276 // tail of the medium chunk list to add_at_head(). The tail is often
2277 // the current chunk but there are probably exceptions.
2278
2279 // Humongous chunks
2280 if (TraceMetadataChunkAllocation && Verbose) {
2281 gclog_or_tty->print_cr("returned %d %s humongous chunks to dictionary",
2282 sum_count_in_chunks_in_use(HumongousIndex),
2283 chunk_size_name(HumongousIndex));
2284 gclog_or_tty->print("Humongous chunk dictionary: ");
2285 }
2286 // Humongous chunks are never the current chunk.
2287 Metachunk* humongous_chunks = chunks_in_use(HumongousIndex);
2288
2289 while (humongous_chunks != NULL) {
2290 #ifdef ASSERT
2291 humongous_chunks->set_is_tagged_free(true);
2292 #endif
2293 if (TraceMetadataChunkAllocation && Verbose) {
2294 gclog_or_tty->print(PTR_FORMAT " (" SIZE_FORMAT ") ",
2295 humongous_chunks,
2296 humongous_chunks->word_size());
2297 }
2298 assert(humongous_chunks->word_size() == (size_t)
2299 align_size_up(humongous_chunks->word_size(),
2300 smallest_chunk_size()),
2301 err_msg("Humongous chunk size is wrong: word size " SIZE_FORMAT
2302 " granularity %d",
2303 humongous_chunks->word_size(), smallest_chunk_size()));
2304 Metachunk* next_humongous_chunks = humongous_chunks->next();
2305 humongous_chunks->container()->dec_container_count();
2306 chunk_manager()->humongous_dictionary()->return_chunk(humongous_chunks);
2307 humongous_chunks = next_humongous_chunks;
2308 }
2309 if (TraceMetadataChunkAllocation && Verbose) {
2310 gclog_or_tty->cr();
2311 gclog_or_tty->print_cr("updated dictionary count %d %s",
2312 chunk_manager()->humongous_dictionary()->total_count(),
2313 chunk_size_name(HumongousIndex));
2314 }
2315 chunk_manager()->slow_locked_verify();
2316 }
2317
2318 const char* SpaceManager::chunk_size_name(ChunkIndex index) const {
2319 switch (index) {
2320 case SpecializedIndex:
2321 return "Specialized";
2322 case SmallIndex:
2323 return "Small";
2324 case MediumIndex:
2325 return "Medium";
2326 case HumongousIndex:
2327 return "Humongous";
2328 default:
2329 return NULL;
2330 }
2331 }
2332
2333 ChunkIndex ChunkManager::list_index(size_t size) {
2334 switch (size) {
2335 case SpecializedChunk:
2336 assert(SpecializedChunk == ClassSpecializedChunk,
2337 "Need branch for ClassSpecializedChunk");
2338 return SpecializedIndex;
2339 case SmallChunk:
2340 case ClassSmallChunk:
2341 return SmallIndex;
2342 case MediumChunk:
2343 case ClassMediumChunk:
2344 return MediumIndex;
2345 default:
2346 assert(size > MediumChunk || size > ClassMediumChunk,
2347 "Not a humongous chunk");
2348 return HumongousIndex;
2349 }
2350 }
2351
2352 void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
2353 assert_lock_strong(_lock);
2354 size_t raw_word_size = get_raw_word_size(word_size);
2355 size_t min_size = TreeChunk<Metablock, FreeList<Metablock> >::min_size();
2356 assert(raw_word_size >= min_size,
2357 err_msg("Should not deallocate dark matter " SIZE_FORMAT "<" SIZE_FORMAT, word_size, min_size));
2358 block_freelists()->return_block(p, raw_word_size);
2359 }
2360
2361 // Adds a chunk to the list of chunks in use.
2362 void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
2363
2364 assert(new_chunk != NULL, "Should not be NULL");
2365 assert(new_chunk->next() == NULL, "Should not be on a list");
2366
2367 new_chunk->reset_empty();
2368
2369 // Find the correct list and and set the current
2370 // chunk for that list.
2371 ChunkIndex index = ChunkManager::list_index(new_chunk->word_size());
2372
2373 if (index != HumongousIndex) {
2374 retire_current_chunk();
2375 set_current_chunk(new_chunk);
2376 new_chunk->set_next(chunks_in_use(index));
2377 set_chunks_in_use(index, new_chunk);
2378 } else {
2379 // For null class loader data and DumpSharedSpaces, the first chunk isn't
2380 // small, so small will be null. Link this first chunk as the current
2381 // chunk.
2382 if (make_current) {
2383 // Set as the current chunk but otherwise treat as a humongous chunk.
2384 set_current_chunk(new_chunk);
2385 }
2386 // Link at head. The _current_chunk only points to a humongous chunk for
2387 // the null class loader metaspace (class and data virtual space managers)
2388 // any humongous chunks so will not point to the tail
2389 // of the humongous chunks list.
2390 new_chunk->set_next(chunks_in_use(HumongousIndex));
2391 set_chunks_in_use(HumongousIndex, new_chunk);
2392
2393 assert(new_chunk->word_size() > medium_chunk_size(), "List inconsistency");
2394 }
2395
2396 // Add to the running sum of capacity
2397 inc_size_metrics(new_chunk->word_size());
2398
2399 assert(new_chunk->is_empty(), "Not ready for reuse");
2400 if (TraceMetadataChunkAllocation && Verbose) {
2401 gclog_or_tty->print("SpaceManager::add_chunk: %d) ",
2402 sum_count_in_chunks_in_use());
2403 new_chunk->print_on(gclog_or_tty);
2404 chunk_manager()->locked_print_free_chunks(gclog_or_tty);
2405 }
2406 }
2407
2408 void SpaceManager::retire_current_chunk() {
2409 if (current_chunk() != NULL) {
2410 size_t remaining_words = current_chunk()->free_word_size();
2411 if (remaining_words >= TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
2412 block_freelists()->return_block(current_chunk()->allocate(remaining_words), remaining_words);
2413 inc_used_metrics(remaining_words);
2414 }
2415 }
2416 }
2417
2418 Metachunk* SpaceManager::get_new_chunk(size_t word_size,
2419 size_t grow_chunks_by_words) {
2420 // Get a chunk from the chunk freelist
2421 Metachunk* next = chunk_manager()->chunk_freelist_allocate(grow_chunks_by_words);
2422
2423 if (next == NULL) {
2424 next = vs_list()->get_new_chunk(word_size,
2425 grow_chunks_by_words,
2426 medium_chunk_bunch());
2427 }
2428
2429 if (TraceMetadataHumongousAllocation && next != NULL &&
2430 SpaceManager::is_humongous(next->word_size())) {
2431 gclog_or_tty->print_cr(" new humongous chunk word size "
2432 PTR_FORMAT, next->word_size());
2433 }
2434
2435 return next;
2436 }
2437
2438 MetaWord* SpaceManager::allocate(size_t word_size) {
2439 MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
2440
2441 size_t raw_word_size = get_raw_word_size(word_size);
2442 BlockFreelist* fl = block_freelists();
2443 MetaWord* p = NULL;
2444 // Allocation from the dictionary is expensive in the sense that
2445 // the dictionary has to be searched for a size. Don't allocate
2446 // from the dictionary until it starts to get fat. Is this
2447 // a reasonable policy? Maybe an skinny dictionary is fast enough
2448 // for allocations. Do some profiling. JJJ
2449 if (fl->total_size() > allocation_from_dictionary_limit) {
2450 p = fl->get_block(raw_word_size);
2451 }
2452 if (p == NULL) {
2453 p = allocate_work(raw_word_size);
2454 }
2455
2456 return p;
2457 }
2458
2459 // Returns the address of spaced allocated for "word_size".
2460 // This methods does not know about blocks (Metablocks)
2461 MetaWord* SpaceManager::allocate_work(size_t word_size) {
2462 assert_lock_strong(_lock);
2463 #ifdef ASSERT
2464 if (Metadebug::test_metadata_failure()) {
2465 return NULL;
2466 }
2467 #endif
2468 // Is there space in the current chunk?
2469 MetaWord* result = NULL;
2470
2471 // For DumpSharedSpaces, only allocate out of the current chunk which is
2472 // never null because we gave it the size we wanted. Caller reports out
2473 // of memory if this returns null.
2474 if (DumpSharedSpaces) {
2475 assert(current_chunk() != NULL, "should never happen");
2476 inc_used_metrics(word_size);
2477 return current_chunk()->allocate(word_size); // caller handles null result
2478 }
2479
2480 if (current_chunk() != NULL) {
2481 result = current_chunk()->allocate(word_size);
2482 }
2483
2484 if (result == NULL) {
2485 result = grow_and_allocate(word_size);
2486 }
2487
2488 if (result != NULL) {
2489 inc_used_metrics(word_size);
2490 assert(result != (MetaWord*) chunks_in_use(MediumIndex),
2491 "Head of the list is being allocated");
2492 }
2493
2494 return result;
2495 }
2496
2497 void SpaceManager::verify() {
2498 // If there are blocks in the dictionary, then
2499 // verification of chunks does not work since
2500 // being in the dictionary alters a chunk.
2501 if (block_freelists()->total_size() == 0) {
2502 for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
2503 Metachunk* curr = chunks_in_use(i);
2504 while (curr != NULL) {
2505 curr->verify();
2506 verify_chunk_size(curr);
2507 curr = curr->next();
2508 }
2509 }
2510 }
2511 }
2512
2513 void SpaceManager::verify_chunk_size(Metachunk* chunk) {
2514 assert(is_humongous(chunk->word_size()) ||
2515 chunk->word_size() == medium_chunk_size() ||
2516 chunk->word_size() == small_chunk_size() ||
2517 chunk->word_size() == specialized_chunk_size(),
2518 "Chunk size is wrong");
2519 return;
2520 }
2521
2522 #ifdef ASSERT
2523 void SpaceManager::verify_allocated_blocks_words() {
2524 // Verification is only guaranteed at a safepoint.
2525 assert(SafepointSynchronize::is_at_safepoint() || !Universe::is_fully_initialized(),
2526 "Verification can fail if the applications is running");
2527 assert(allocated_blocks_words() == sum_used_in_chunks_in_use(),
2528 err_msg("allocation total is not consistent " SIZE_FORMAT
2529 " vs " SIZE_FORMAT,
2530 allocated_blocks_words(), sum_used_in_chunks_in_use()));
2531 }
2532
2533 #endif
2534
2535 void SpaceManager::dump(outputStream* const out) const {
2536 size_t curr_total = 0;
2537 size_t waste = 0;
2538 uint i = 0;
2539 size_t used = 0;
2540 size_t capacity = 0;
2541
2542 // Add up statistics for all chunks in this SpaceManager.
2543 for (ChunkIndex index = ZeroIndex;
2544 index < NumberOfInUseLists;
2545 index = next_chunk_index(index)) {
2546 for (Metachunk* curr = chunks_in_use(index);
2547 curr != NULL;
2548 curr = curr->next()) {
2549 out->print("%d) ", i++);
2550 curr->print_on(out);
2551 curr_total += curr->word_size();
2552 used += curr->used_word_size();
2553 capacity += curr->word_size();
2554 waste += curr->free_word_size() + curr->overhead();;
2555 }
2556 }
2557
2558 if (TraceMetadataChunkAllocation && Verbose) {
2559 block_freelists()->print_on(out);
2560 }
2561
2562 size_t free = current_chunk() == NULL ? 0 : current_chunk()->free_word_size();
2563 // Free space isn't wasted.
2564 waste -= free;
2565
2566 out->print_cr("total of all chunks " SIZE_FORMAT " used " SIZE_FORMAT
2567 " free " SIZE_FORMAT " capacity " SIZE_FORMAT
2568 " waste " SIZE_FORMAT, curr_total, used, free, capacity, waste);
2569 }
2570
2571 #ifndef PRODUCT
2572 void SpaceManager::mangle_freed_chunks() {
2573 for (ChunkIndex index = ZeroIndex;
2574 index < NumberOfInUseLists;
2575 index = next_chunk_index(index)) {
2576 for (Metachunk* curr = chunks_in_use(index);
2577 curr != NULL;
2578 curr = curr->next()) {
2579 curr->mangle();
2580 }
2581 }
2582 }
2583 #endif // PRODUCT
2584
2585 // MetaspaceAux
2586
2587
2588 size_t MetaspaceAux::_capacity_words[] = {0, 0};
2589 size_t MetaspaceAux::_used_words[] = {0, 0};
2590
2591 size_t MetaspaceAux::free_bytes(Metaspace::MetadataType mdtype) {
2592 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2593 return list == NULL ? 0 : list->free_bytes();
2594 }
2595
2596 size_t MetaspaceAux::free_bytes() {
2597 return free_bytes(Metaspace::ClassType) + free_bytes(Metaspace::NonClassType);
2598 }
2599
2600 void MetaspaceAux::dec_capacity(Metaspace::MetadataType mdtype, size_t words) {
2601 assert_lock_strong(SpaceManager::expand_lock());
2602 assert(words <= capacity_words(mdtype),
2603 err_msg("About to decrement below 0: words " SIZE_FORMAT
2604 " is greater than _capacity_words[%u] " SIZE_FORMAT,
2605 words, mdtype, capacity_words(mdtype)));
2606 _capacity_words[mdtype] -= words;
2607 }
2608
2609 void MetaspaceAux::inc_capacity(Metaspace::MetadataType mdtype, size_t words) {
2610 assert_lock_strong(SpaceManager::expand_lock());
2611 // Needs to be atomic
2612 _capacity_words[mdtype] += words;
2613 }
2614
2615 void MetaspaceAux::dec_used(Metaspace::MetadataType mdtype, size_t words) {
2616 assert(words <= used_words(mdtype),
2617 err_msg("About to decrement below 0: words " SIZE_FORMAT
2618 " is greater than _used_words[%u] " SIZE_FORMAT,
2619 words, mdtype, used_words(mdtype)));
2620 // For CMS deallocation of the Metaspaces occurs during the
2621 // sweep which is a concurrent phase. Protection by the expand_lock()
2622 // is not enough since allocation is on a per Metaspace basis
2623 // and protected by the Metaspace lock.
2624 jlong minus_words = (jlong) - (jlong) words;
2625 Atomic::add_ptr(minus_words, &_used_words[mdtype]);
2626 }
2627
2628 void MetaspaceAux::inc_used(Metaspace::MetadataType mdtype, size_t words) {
2629 // _used_words tracks allocations for
2630 // each piece of metadata. Those allocations are
2631 // generally done concurrently by different application
2632 // threads so must be done atomically.
2633 Atomic::add_ptr(words, &_used_words[mdtype]);
2634 }
2635
2636 size_t MetaspaceAux::used_bytes_slow(Metaspace::MetadataType mdtype) {
2637 size_t used = 0;
2638 ClassLoaderDataGraphMetaspaceIterator iter;
2639 while (iter.repeat()) {
2640 Metaspace* msp = iter.get_next();
2641 // Sum allocated_blocks_words for each metaspace
2642 if (msp != NULL) {
2643 used += msp->used_words_slow(mdtype);
2644 }
2645 }
2646 return used * BytesPerWord;
2647 }
2648
2649 size_t MetaspaceAux::free_bytes_slow(Metaspace::MetadataType mdtype) {
2650 size_t free = 0;
2651 ClassLoaderDataGraphMetaspaceIterator iter;
2652 while (iter.repeat()) {
2653 Metaspace* msp = iter.get_next();
2654 if (msp != NULL) {
2655 free += msp->free_words_slow(mdtype);
2656 }
2657 }
2658 return free * BytesPerWord;
2659 }
2660
2661 size_t MetaspaceAux::capacity_bytes_slow(Metaspace::MetadataType mdtype) {
2662 if ((mdtype == Metaspace::ClassType) && !Metaspace::using_class_space()) {
2663 return 0;
2664 }
2665 // Don't count the space in the freelists. That space will be
2666 // added to the capacity calculation as needed.
2667 size_t capacity = 0;
2668 ClassLoaderDataGraphMetaspaceIterator iter;
2669 while (iter.repeat()) {
2670 Metaspace* msp = iter.get_next();
2671 if (msp != NULL) {
2672 capacity += msp->capacity_words_slow(mdtype);
2673 }
2674 }
2675 return capacity * BytesPerWord;
2676 }
2677
2678 size_t MetaspaceAux::capacity_bytes_slow() {
2679 #ifdef PRODUCT
2680 // Use capacity_bytes() in PRODUCT instead of this function.
2681 guarantee(false, "Should not call capacity_bytes_slow() in the PRODUCT");
2682 #endif
2683 size_t class_capacity = capacity_bytes_slow(Metaspace::ClassType);
2684 size_t non_class_capacity = capacity_bytes_slow(Metaspace::NonClassType);
2685 assert(capacity_bytes() == class_capacity + non_class_capacity,
2686 err_msg("bad accounting: capacity_bytes() " SIZE_FORMAT
2687 " class_capacity + non_class_capacity " SIZE_FORMAT
2688 " class_capacity " SIZE_FORMAT " non_class_capacity " SIZE_FORMAT,
2689 capacity_bytes(), class_capacity + non_class_capacity,
2690 class_capacity, non_class_capacity));
2691
2692 return class_capacity + non_class_capacity;
2693 }
2694
2695 size_t MetaspaceAux::reserved_bytes(Metaspace::MetadataType mdtype) {
2696 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2697 return list == NULL ? 0 : list->reserved_bytes();
2698 }
2699
2700 size_t MetaspaceAux::committed_bytes(Metaspace::MetadataType mdtype) {
2701 VirtualSpaceList* list = Metaspace::get_space_list(mdtype);
2702 return list == NULL ? 0 : list->committed_bytes();
2703 }
2704
2705 size_t MetaspaceAux::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); }
2706
2707 size_t MetaspaceAux::free_chunks_total_words(Metaspace::MetadataType mdtype) {
2708 ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype);
2709 if (chunk_manager == NULL) {
2710 return 0;
2711 }
2712 chunk_manager->slow_verify();
2713 return chunk_manager->free_chunks_total_words();
2714 }
2715
2716 size_t MetaspaceAux::free_chunks_total_bytes(Metaspace::MetadataType mdtype) {
2717 return free_chunks_total_words(mdtype) * BytesPerWord;
2718 }
2719
2720 size_t MetaspaceAux::free_chunks_total_words() {
2721 return free_chunks_total_words(Metaspace::ClassType) +
2722 free_chunks_total_words(Metaspace::NonClassType);
2723 }
2724
2725 size_t MetaspaceAux::free_chunks_total_bytes() {
2726 return free_chunks_total_words() * BytesPerWord;
2727 }
2728
2729 bool MetaspaceAux::has_chunk_free_list(Metaspace::MetadataType mdtype) {
2730 return Metaspace::get_chunk_manager(mdtype) != NULL;
2731 }
2732
2733 MetaspaceChunkFreeListSummary MetaspaceAux::chunk_free_list_summary(Metaspace::MetadataType mdtype) {
2734 if (!has_chunk_free_list(mdtype)) {
2735 return MetaspaceChunkFreeListSummary();
2736 }
2737
2738 const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype);
2739 return cm->chunk_free_list_summary();
2740 }
2741
2742 void MetaspaceAux::print_metaspace_change(size_t prev_metadata_used) {
2743 gclog_or_tty->print(", [Metaspace:");
2744 if (PrintGCDetails && Verbose) {
2745 gclog_or_tty->print(" " SIZE_FORMAT
2746 "->" SIZE_FORMAT
2747 "(" SIZE_FORMAT ")",
2748 prev_metadata_used,
2749 used_bytes(),
2750 reserved_bytes());
2751 } else {
2752 gclog_or_tty->print(" " SIZE_FORMAT "K"
2753 "->" SIZE_FORMAT "K"
2754 "(" SIZE_FORMAT "K)",
2755 prev_metadata_used/K,
2756 used_bytes()/K,
2757 reserved_bytes()/K);
2758 }
2759
2760 gclog_or_tty->print("]");
2761 }
2762
2763 // This is printed when PrintGCDetails
2764 void MetaspaceAux::print_on(outputStream* out) {
2765 Metaspace::MetadataType nct = Metaspace::NonClassType;
2766
2767 out->print_cr(" Metaspace "
2768 "used " SIZE_FORMAT "K, "
2769 "capacity " SIZE_FORMAT "K, "
2770 "committed " SIZE_FORMAT "K, "
2771 "reserved " SIZE_FORMAT "K",
2772 used_bytes()/K,
2773 capacity_bytes()/K,
2774 committed_bytes()/K,
2775 reserved_bytes()/K);
2776
2777 if (Metaspace::using_class_space()) {
2778 Metaspace::MetadataType ct = Metaspace::ClassType;
2779 out->print_cr(" class space "
2780 "used " SIZE_FORMAT "K, "
2781 "capacity " SIZE_FORMAT "K, "
2782 "committed " SIZE_FORMAT "K, "
2783 "reserved " SIZE_FORMAT "K",
2784 used_bytes(ct)/K,
2785 capacity_bytes(ct)/K,
2786 committed_bytes(ct)/K,
2787 reserved_bytes(ct)/K);
2788 }
2789 }
2790
2791 // Print information for class space and data space separately.
2792 // This is almost the same as above.
2793 void MetaspaceAux::print_on(outputStream* out, Metaspace::MetadataType mdtype) {
2794 size_t free_chunks_capacity_bytes = free_chunks_total_bytes(mdtype);
2795 size_t capacity_bytes = capacity_bytes_slow(mdtype);
2796 size_t used_bytes = used_bytes_slow(mdtype);
2797 size_t free_bytes = free_bytes_slow(mdtype);
2798 size_t used_and_free = used_bytes + free_bytes +
2799 free_chunks_capacity_bytes;
2800 out->print_cr(" Chunk accounting: used in chunks " SIZE_FORMAT
2801 "K + unused in chunks " SIZE_FORMAT "K + "
2802 " capacity in free chunks " SIZE_FORMAT "K = " SIZE_FORMAT
2803 "K capacity in allocated chunks " SIZE_FORMAT "K",
2804 used_bytes / K,
2805 free_bytes / K,
2806 free_chunks_capacity_bytes / K,
2807 used_and_free / K,
2808 capacity_bytes / K);
2809 // Accounting can only be correct if we got the values during a safepoint
2810 assert(!SafepointSynchronize::is_at_safepoint() || used_and_free == capacity_bytes, "Accounting is wrong");
2811 }
2812
2813 // Print total fragmentation for class metaspaces
2814 void MetaspaceAux::print_class_waste(outputStream* out) {
2815 assert(Metaspace::using_class_space(), "class metaspace not used");
2816 size_t cls_specialized_waste = 0, cls_small_waste = 0, cls_medium_waste = 0;
2817 size_t cls_specialized_count = 0, cls_small_count = 0, cls_medium_count = 0, cls_humongous_count = 0;
2818 ClassLoaderDataGraphMetaspaceIterator iter;
2819 while (iter.repeat()) {
2820 Metaspace* msp = iter.get_next();
2821 if (msp != NULL) {
2822 cls_specialized_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2823 cls_specialized_count += msp->class_vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2824 cls_small_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2825 cls_small_count += msp->class_vsm()->sum_count_in_chunks_in_use(SmallIndex);
2826 cls_medium_waste += msp->class_vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2827 cls_medium_count += msp->class_vsm()->sum_count_in_chunks_in_use(MediumIndex);
2828 cls_humongous_count += msp->class_vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2829 }
2830 }
2831 out->print_cr(" class: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2832 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2833 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2834 "large count " SIZE_FORMAT,
2835 cls_specialized_count, cls_specialized_waste,
2836 cls_small_count, cls_small_waste,
2837 cls_medium_count, cls_medium_waste, cls_humongous_count);
2838 }
2839
2840 // Print total fragmentation for data and class metaspaces separately
2841 void MetaspaceAux::print_waste(outputStream* out) {
2842 size_t specialized_waste = 0, small_waste = 0, medium_waste = 0;
2843 size_t specialized_count = 0, small_count = 0, medium_count = 0, humongous_count = 0;
2844
2845 ClassLoaderDataGraphMetaspaceIterator iter;
2846 while (iter.repeat()) {
2847 Metaspace* msp = iter.get_next();
2848 if (msp != NULL) {
2849 specialized_waste += msp->vsm()->sum_waste_in_chunks_in_use(SpecializedIndex);
2850 specialized_count += msp->vsm()->sum_count_in_chunks_in_use(SpecializedIndex);
2851 small_waste += msp->vsm()->sum_waste_in_chunks_in_use(SmallIndex);
2852 small_count += msp->vsm()->sum_count_in_chunks_in_use(SmallIndex);
2853 medium_waste += msp->vsm()->sum_waste_in_chunks_in_use(MediumIndex);
2854 medium_count += msp->vsm()->sum_count_in_chunks_in_use(MediumIndex);
2855 humongous_count += msp->vsm()->sum_count_in_chunks_in_use(HumongousIndex);
2856 }
2857 }
2858 out->print_cr("Total fragmentation waste (words) doesn't count free space");
2859 out->print_cr(" data: " SIZE_FORMAT " specialized(s) " SIZE_FORMAT ", "
2860 SIZE_FORMAT " small(s) " SIZE_FORMAT ", "
2861 SIZE_FORMAT " medium(s) " SIZE_FORMAT ", "
2862 "large count " SIZE_FORMAT,
2863 specialized_count, specialized_waste, small_count,
2864 small_waste, medium_count, medium_waste, humongous_count);
2865 if (Metaspace::using_class_space()) {
2866 print_class_waste(out);
2867 }
2868 }
2869
2870 // Dump global metaspace things from the end of ClassLoaderDataGraph
2871 void MetaspaceAux::dump(outputStream* out) {
2872 out->print_cr("All Metaspace:");
2873 out->print("data space: "); print_on(out, Metaspace::NonClassType);
2874 out->print("class space: "); print_on(out, Metaspace::ClassType);
2875 print_waste(out);
2876 }
2877
2878 void MetaspaceAux::verify_free_chunks() {
2879 Metaspace::chunk_manager_metadata()->verify();
2880 if (Metaspace::using_class_space()) {
2881 Metaspace::chunk_manager_class()->verify();
2882 }
2883 }
2884
2885 void MetaspaceAux::verify_capacity() {
2886 #ifdef ASSERT
2887 size_t running_sum_capacity_bytes = capacity_bytes();
2888 // For purposes of the running sum of capacity, verify against capacity
2889 size_t capacity_in_use_bytes = capacity_bytes_slow();
2890 assert(running_sum_capacity_bytes == capacity_in_use_bytes,
2891 err_msg("capacity_words() * BytesPerWord " SIZE_FORMAT
2892 " capacity_bytes_slow()" SIZE_FORMAT,
2893 running_sum_capacity_bytes, capacity_in_use_bytes));
2894 for (Metaspace::MetadataType i = Metaspace::ClassType;
2895 i < Metaspace:: MetadataTypeCount;
2896 i = (Metaspace::MetadataType)(i + 1)) {
2897 size_t capacity_in_use_bytes = capacity_bytes_slow(i);
2898 assert(capacity_bytes(i) == capacity_in_use_bytes,
2899 err_msg("capacity_bytes(%u) " SIZE_FORMAT
2900 " capacity_bytes_slow(%u)" SIZE_FORMAT,
2901 i, capacity_bytes(i), i, capacity_in_use_bytes));
2902 }
2903 #endif
2904 }
2905
2906 void MetaspaceAux::verify_used() {
2907 #ifdef ASSERT
2908 size_t running_sum_used_bytes = used_bytes();
2909 // For purposes of the running sum of used, verify against used
2910 size_t used_in_use_bytes = used_bytes_slow();
2911 assert(used_bytes() == used_in_use_bytes,
2912 err_msg("used_bytes() " SIZE_FORMAT
2913 " used_bytes_slow()" SIZE_FORMAT,
2914 used_bytes(), used_in_use_bytes));
2915 for (Metaspace::MetadataType i = Metaspace::ClassType;
2916 i < Metaspace:: MetadataTypeCount;
2917 i = (Metaspace::MetadataType)(i + 1)) {
2918 size_t used_in_use_bytes = used_bytes_slow(i);
2919 assert(used_bytes(i) == used_in_use_bytes,
2920 err_msg("used_bytes(%u) " SIZE_FORMAT
2921 " used_bytes_slow(%u)" SIZE_FORMAT,
2922 i, used_bytes(i), i, used_in_use_bytes));
2923 }
2924 #endif
2925 }
2926
2927 void MetaspaceAux::verify_metrics() {
2928 verify_capacity();
2929 verify_used();
2930 }
2931
2932
2933 // Metaspace methods
2934
2935 size_t Metaspace::_first_chunk_word_size = 0;
2936 size_t Metaspace::_first_class_chunk_word_size = 0;
2937
2938 size_t Metaspace::_commit_alignment = 0;
2939 size_t Metaspace::_reserve_alignment = 0;
2940
2941 Metaspace::Metaspace(Mutex* lock, MetaspaceType type) {
2942 initialize(lock, type);
2943 }
2944
2945 Metaspace::~Metaspace() {
2946 delete _vsm;
2947 if (using_class_space()) {
2948 delete _class_vsm;
2949 }
2950 }
2951
2952 VirtualSpaceList* Metaspace::_space_list = NULL;
2953 VirtualSpaceList* Metaspace::_class_space_list = NULL;
2954
2955 ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
2956 ChunkManager* Metaspace::_chunk_manager_class = NULL;
2957
2958 #define VIRTUALSPACEMULTIPLIER 2
2959
2960 #ifdef _LP64
2961 static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
2962
2963 void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) {
2964 // Figure out the narrow_klass_base and the narrow_klass_shift. The
2965 // narrow_klass_base is the lower of the metaspace base and the cds base
2966 // (if cds is enabled). The narrow_klass_shift depends on the distance
2967 // between the lower base and higher address.
2968 address lower_base;
2969 address higher_address;
2970 #if INCLUDE_CDS
2971 if (UseSharedSpaces) {
2972 higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
2973 (address)(metaspace_base + compressed_class_space_size()));
2974 lower_base = MIN2(metaspace_base, cds_base);
2975 } else
2976 #endif
2977 {
2978 higher_address = metaspace_base + compressed_class_space_size();
2979 lower_base = metaspace_base;
2980
2981 uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes;
2982 // If compressed class space fits in lower 32G, we don't need a base.
2983 if (higher_address <= (address)klass_encoding_max) {
2984 lower_base = 0; // Effectively lower base is zero.
2985 }
2986 }
2987
2988 Universe::set_narrow_klass_base(lower_base);
2989
2990 if ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) {
2991 Universe::set_narrow_klass_shift(0);
2992 } else {
2993 assert(!UseSharedSpaces, "Cannot shift with UseSharedSpaces");
2994 Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
2995 }
2996 }
2997
2998 #if INCLUDE_CDS
2999 // Return TRUE if the specified metaspace_base and cds_base are close enough
3000 // to work with compressed klass pointers.
3001 bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) {
3002 assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS");
3003 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
3004 address lower_base = MIN2((address)metaspace_base, cds_base);
3005 address higher_address = MAX2((address)(cds_base + FileMapInfo::shared_spaces_size()),
3006 (address)(metaspace_base + compressed_class_space_size()));
3007 return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax);
3008 }
3009 #endif
3010
3011 // Try to allocate the metaspace at the requested addr.
3012 void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) {
3013 assert(using_class_space(), "called improperly");
3014 assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs");
3015 assert(compressed_class_space_size() < KlassEncodingMetaspaceMax,
3016 "Metaspace size is too big");
3017 assert_is_ptr_aligned(requested_addr, _reserve_alignment);
3018 assert_is_ptr_aligned(cds_base, _reserve_alignment);
3019 assert_is_size_aligned(compressed_class_space_size(), _reserve_alignment);
3020
3021 // Don't use large pages for the class space.
3022 bool large_pages = false;
3023
3024 ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
3025 _reserve_alignment,
3026 large_pages,
3027 requested_addr, 0);
3028 if (!metaspace_rs.is_reserved()) {
3029 #if INCLUDE_CDS
3030 if (UseSharedSpaces) {
3031 size_t increment = align_size_up(1*G, _reserve_alignment);
3032
3033 // Keep trying to allocate the metaspace, increasing the requested_addr
3034 // by 1GB each time, until we reach an address that will no longer allow
3035 // use of CDS with compressed klass pointers.
3036 char *addr = requested_addr;
3037 while (!metaspace_rs.is_reserved() && (addr + increment > addr) &&
3038 can_use_cds_with_metaspace_addr(addr + increment, cds_base)) {
3039 addr = addr + increment;
3040 metaspace_rs = ReservedSpace(compressed_class_space_size(),
3041 _reserve_alignment, large_pages, addr, 0);
3042 }
3043 }
3044 #endif
3045 // If no successful allocation then try to allocate the space anywhere. If
3046 // that fails then OOM doom. At this point we cannot try allocating the
3047 // metaspace as if UseCompressedClassPointers is off because too much
3048 // initialization has happened that depends on UseCompressedClassPointers.
3049 // So, UseCompressedClassPointers cannot be turned off at this point.
3050 if (!metaspace_rs.is_reserved()) {
3051 metaspace_rs = ReservedSpace(compressed_class_space_size(),
3052 _reserve_alignment, large_pages);
3053 if (!metaspace_rs.is_reserved()) {
3054 vm_exit_during_initialization(err_msg("Could not allocate metaspace: %d bytes",
3055 compressed_class_space_size()));
3056 }
3057 }
3058 }
3059
3060 // If we got here then the metaspace got allocated.
3061 MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
3062
3063 #if INCLUDE_CDS
3064 // Verify that we can use shared spaces. Otherwise, turn off CDS.
3065 if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) {
3066 FileMapInfo::stop_sharing_and_unmap(
3067 "Could not allocate metaspace at a compatible address");
3068 }
3069 #endif
3070 set_narrow_klass_base_and_shift((address)metaspace_rs.base(),
3071 UseSharedSpaces ? (address)cds_base : 0);
3072
3073 initialize_class_space(metaspace_rs);
3074
3075 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
3076 gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
3077 Universe::narrow_klass_base(), Universe::narrow_klass_shift());
3078 gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
3079 compressed_class_space_size(), metaspace_rs.base(), requested_addr);
3080 }
3081 }
3082
3083 // For UseCompressedClassPointers the class space is reserved above the top of
3084 // the Java heap. The argument passed in is at the base of the compressed space.
3085 void Metaspace::initialize_class_space(ReservedSpace rs) {
3086 // The reserved space size may be bigger because of alignment, esp with UseLargePages
3087 assert(rs.size() >= CompressedClassSpaceSize,
3088 err_msg(SIZE_FORMAT " != " UINTX_FORMAT, rs.size(), CompressedClassSpaceSize));
3089 assert(using_class_space(), "Must be using class space");
3090 _class_space_list = new VirtualSpaceList(rs);
3091 _chunk_manager_class = new ChunkManager(SpecializedChunk, ClassSmallChunk, ClassMediumChunk);
3092
3093 if (!_class_space_list->initialization_succeeded()) {
3094 vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
3095 }
3096 }
3097
3098 #endif
3099
3100 void Metaspace::ergo_initialize() {
3101 if (DumpSharedSpaces) {
3102 // Using large pages when dumping the shared archive is currently not implemented.
3103 FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false);
3104 }
3105
3106 size_t page_size = os::vm_page_size();
3107 if (UseLargePages && UseLargePagesInMetaspace) {
3108 page_size = os::large_page_size();
3109 }
3110
3111 _commit_alignment = page_size;
3112 _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
3113
3114 // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
3115 // override if MaxMetaspaceSize was set on the command line or not.
3116 // This information is needed later to conform to the specification of the
3117 // java.lang.management.MemoryUsage API.
3118 //
3119 // Ideally, we would be able to set the default value of MaxMetaspaceSize in
3120 // globals.hpp to the aligned value, but this is not possible, since the
3121 // alignment depends on other flags being parsed.
3122 MaxMetaspaceSize = align_size_down_bounded(MaxMetaspaceSize, _reserve_alignment);
3123
3124 if (MetaspaceSize > MaxMetaspaceSize) {
3125 MetaspaceSize = MaxMetaspaceSize;
3126 }
3127
3128 MetaspaceSize = align_size_down_bounded(MetaspaceSize, _commit_alignment);
3129
3130 assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize");
3131
3132 if (MetaspaceSize < 256*K) {
3133 vm_exit_during_initialization("Too small initial Metaspace size");
3134 }
3135
3136 MinMetaspaceExpansion = align_size_down_bounded(MinMetaspaceExpansion, _commit_alignment);
3137 MaxMetaspaceExpansion = align_size_down_bounded(MaxMetaspaceExpansion, _commit_alignment);
3138
3139 CompressedClassSpaceSize = align_size_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
3140 set_compressed_class_space_size(CompressedClassSpaceSize);
3141 }
3142
3143 void Metaspace::global_initialize() {
3144 MetaspaceGC::initialize();
3145
3146 // Initialize the alignment for shared spaces.
3147 int max_alignment = os::vm_allocation_granularity();
3148 size_t cds_total = 0;
3149
3150 MetaspaceShared::set_max_alignment(max_alignment);
3151
3152 if (DumpSharedSpaces) {
3153 #if INCLUDE_CDS
3154 MetaspaceShared::estimate_regions_size();
3155
3156 SharedReadOnlySize = align_size_up(SharedReadOnlySize, max_alignment);
3157 SharedReadWriteSize = align_size_up(SharedReadWriteSize, max_alignment);
3158 SharedMiscDataSize = align_size_up(SharedMiscDataSize, max_alignment);
3159 SharedMiscCodeSize = align_size_up(SharedMiscCodeSize, max_alignment);
3160
3161 // make sure SharedReadOnlySize and SharedReadWriteSize are not less than
3162 // the minimum values.
3163 if (SharedReadOnlySize < MetaspaceShared::min_ro_size){
3164 report_out_of_shared_space(SharedReadOnly);
3165 }
3166
3167 if (SharedReadWriteSize < MetaspaceShared::min_rw_size){
3168 report_out_of_shared_space(SharedReadWrite);
3169 }
3170
3171 // the min_misc_data_size and min_misc_code_size estimates are based on
3172 // MetaspaceShared::generate_vtable_methods()
3173 uint min_misc_data_size = align_size_up(
3174 MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size * sizeof(void*), max_alignment);
3175
3176 if (SharedMiscDataSize < min_misc_data_size) {
3177 report_out_of_shared_space(SharedMiscData);
3178 }
3179
3180 uintx min_misc_code_size = align_size_up(
3181 (MetaspaceShared::num_virtuals * MetaspaceShared::vtbl_list_size) *
3182 (sizeof(void*) + MetaspaceShared::vtbl_method_size) + MetaspaceShared::vtbl_common_code_size,
3183 max_alignment);
3184
3185 if (SharedMiscCodeSize < min_misc_code_size) {
3186 report_out_of_shared_space(SharedMiscCode);
3187 }
3188
3189 // Initialize with the sum of the shared space sizes. The read-only
3190 // and read write metaspace chunks will be allocated out of this and the
3191 // remainder is the misc code and data chunks.
3192 cds_total = FileMapInfo::shared_spaces_size();
3193 cds_total = align_size_up(cds_total, _reserve_alignment);
3194 _space_list = new VirtualSpaceList(cds_total/wordSize);
3195 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3196
3197 if (!_space_list->initialization_succeeded()) {
3198 vm_exit_during_initialization("Unable to dump shared archive.", NULL);
3199 }
3200
3201 #ifdef _LP64
3202 if (cds_total + compressed_class_space_size() > UnscaledClassSpaceMax) {
3203 vm_exit_during_initialization("Unable to dump shared archive.",
3204 err_msg("Size of archive (" SIZE_FORMAT ") + compressed class space ("
3205 SIZE_FORMAT ") == total (" SIZE_FORMAT ") is larger than compressed "
3206 "klass limit: " SIZE_FORMAT, cds_total, compressed_class_space_size(),
3207 cds_total + compressed_class_space_size(), UnscaledClassSpaceMax));
3208 }
3209
3210 // Set the compressed klass pointer base so that decoding of these pointers works
3211 // properly when creating the shared archive.
3212 assert(UseCompressedOops && UseCompressedClassPointers,
3213 "UseCompressedOops and UseCompressedClassPointers must be set");
3214 Universe::set_narrow_klass_base((address)_space_list->current_virtual_space()->bottom());
3215 if (TraceMetavirtualspaceAllocation && Verbose) {
3216 gclog_or_tty->print_cr("Setting_narrow_klass_base to Address: " PTR_FORMAT,
3217 _space_list->current_virtual_space()->bottom());
3218 }
3219
3220 Universe::set_narrow_klass_shift(0);
3221 #endif // _LP64
3222 #endif // INCLUDE_CDS
3223 } else {
3224 #if INCLUDE_CDS
3225 // If using shared space, open the file that contains the shared space
3226 // and map in the memory before initializing the rest of metaspace (so
3227 // the addresses don't conflict)
3228 address cds_address = NULL;
3229 if (UseSharedSpaces) {
3230 FileMapInfo* mapinfo = new FileMapInfo();
3231
3232 // Open the shared archive file, read and validate the header. If
3233 // initialization fails, shared spaces [UseSharedSpaces] are
3234 // disabled and the file is closed.
3235 // Map in spaces now also
3236 if (mapinfo->initialize() && MetaspaceShared::map_shared_spaces(mapinfo)) {
3237 cds_total = FileMapInfo::shared_spaces_size();
3238 cds_address = (address)mapinfo->region_base(0);
3239 } else {
3240 assert(!mapinfo->is_open() && !UseSharedSpaces,
3241 "archive file not closed or shared spaces not disabled.");
3242 }
3243 }
3244 #endif // INCLUDE_CDS
3245 #ifdef _LP64
3246 // If UseCompressedClassPointers is set then allocate the metaspace area
3247 // above the heap and above the CDS area (if it exists).
3248 if (using_class_space()) {
3249 if (UseSharedSpaces) {
3250 #if INCLUDE_CDS
3251 char* cds_end = (char*)(cds_address + cds_total);
3252 cds_end = (char *)align_ptr_up(cds_end, _reserve_alignment);
3253 allocate_metaspace_compressed_klass_ptrs(cds_end, cds_address);
3254 #endif
3255 } else {
3256 char* base = (char*)align_ptr_up(Universe::heap()->reserved_region().end(), _reserve_alignment);
3257 allocate_metaspace_compressed_klass_ptrs(base, 0);
3258 }
3259 }
3260 #endif // _LP64
3261
3262 // Initialize these before initializing the VirtualSpaceList
3263 _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord;
3264 _first_chunk_word_size = align_word_size_up(_first_chunk_word_size);
3265 // Make the first class chunk bigger than a medium chunk so it's not put
3266 // on the medium chunk list. The next chunk will be small and progress
3267 // from there. This size calculated by -version.
3268 _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6,
3269 (CompressedClassSpaceSize/BytesPerWord)*2);
3270 _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size);
3271 // Arbitrarily set the initial virtual space to a multiple
3272 // of the boot class loader size.
3273 size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size;
3274 word_size = align_size_up(word_size, Metaspace::reserve_alignment_words());
3275
3276 // Initialize the list of virtual spaces.
3277 _space_list = new VirtualSpaceList(word_size);
3278 _chunk_manager_metadata = new ChunkManager(SpecializedChunk, SmallChunk, MediumChunk);
3279
3280 if (!_space_list->initialization_succeeded()) {
3281 vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL);
3282 }
3283 }
3284
3285 _tracer = new MetaspaceTracer();
3286 }
3287
3288 void Metaspace::post_initialize() {
3289 MetaspaceGC::post_initialize();
3290 }
3291
3292 Metachunk* Metaspace::get_initialization_chunk(MetadataType mdtype,
3293 size_t chunk_word_size,
3294 size_t chunk_bunch) {
3295 // Get a chunk from the chunk freelist
3296 Metachunk* chunk = get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size);
3297 if (chunk != NULL) {
3298 return chunk;
3299 }
3300
3301 return get_space_list(mdtype)->get_new_chunk(chunk_word_size, chunk_word_size, chunk_bunch);
3302 }
3303
3304 void Metaspace::initialize(Mutex* lock, MetaspaceType type) {
3305
3306 assert(space_list() != NULL,
3307 "Metadata VirtualSpaceList has not been initialized");
3308 assert(chunk_manager_metadata() != NULL,
3309 "Metadata ChunkManager has not been initialized");
3310
3311 _vsm = new SpaceManager(NonClassType, lock);
3312 if (_vsm == NULL) {
3313 return;
3314 }
3315 size_t word_size;
3316 size_t class_word_size;
3317 vsm()->get_initial_chunk_sizes(type, &word_size, &class_word_size);
3318
3319 if (using_class_space()) {
3320 assert(class_space_list() != NULL,
3321 "Class VirtualSpaceList has not been initialized");
3322 assert(chunk_manager_class() != NULL,
3323 "Class ChunkManager has not been initialized");
3324
3325 // Allocate SpaceManager for classes.
3326 _class_vsm = new SpaceManager(ClassType, lock);
3327 if (_class_vsm == NULL) {
3328 return;
3329 }
3330 }
3331
3332 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3333
3334 // Allocate chunk for metadata objects
3335 Metachunk* new_chunk = get_initialization_chunk(NonClassType,
3336 word_size,
3337 vsm()->medium_chunk_bunch());
3338 assert(!DumpSharedSpaces || new_chunk != NULL, "should have enough space for both chunks");
3339 if (new_chunk != NULL) {
3340 // Add to this manager's list of chunks in use and current_chunk().
3341 vsm()->add_chunk(new_chunk, true);
3342 }
3343
3344 // Allocate chunk for class metadata objects
3345 if (using_class_space()) {
3346 Metachunk* class_chunk = get_initialization_chunk(ClassType,
3347 class_word_size,
3348 class_vsm()->medium_chunk_bunch());
3349 if (class_chunk != NULL) {
3350 class_vsm()->add_chunk(class_chunk, true);
3351 }
3352 }
3353
3354 _alloc_record_head = NULL;
3355 _alloc_record_tail = NULL;
3356 }
3357
3358 size_t Metaspace::align_word_size_up(size_t word_size) {
3359 size_t byte_size = word_size * wordSize;
3360 return ReservedSpace::allocation_align_size_up(byte_size) / wordSize;
3361 }
3362
3363 MetaWord* Metaspace::allocate(size_t word_size, MetadataType mdtype) {
3364 // DumpSharedSpaces doesn't use class metadata area (yet)
3365 // Also, don't use class_vsm() unless UseCompressedClassPointers is true.
3366 if (is_class_space_allocation(mdtype)) {
3367 return class_vsm()->allocate(word_size);
3368 } else {
3369 return vsm()->allocate(word_size);
3370 }
3371 }
3372
3373 MetaWord* Metaspace::expand_and_allocate(size_t word_size, MetadataType mdtype) {
3374 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord);
3375 assert(delta_bytes > 0, "Must be");
3376
3377 size_t before = 0;
3378 size_t after = 0;
3379 MetaWord* res;
3380 bool incremented;
3381
3382 // Each thread increments the HWM at most once. Even if the thread fails to increment
3383 // the HWM, an allocation is still attempted. This is because another thread must then
3384 // have incremented the HWM and therefore the allocation might still succeed.
3385 do {
3386 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before);
3387 res = allocate(word_size, mdtype);
3388 } while (!incremented && res == NULL);
3389
3390 if (incremented) {
3391 tracer()->report_gc_threshold(before, after,
3392 MetaspaceGCThresholdUpdater::ExpandAndAllocate);
3393 if (PrintGCDetails && Verbose) {
3394 gclog_or_tty->print_cr("Increase capacity to GC from " SIZE_FORMAT
3395 " to " SIZE_FORMAT, before, after);
3396 }
3397 }
3398
3399 return res;
3400 }
3401
3402 // Space allocated in the Metaspace. This may
3403 // be across several metadata virtual spaces.
3404 char* Metaspace::bottom() const {
3405 assert(DumpSharedSpaces, "only useful and valid for dumping shared spaces");
3406 return (char*)vsm()->current_chunk()->bottom();
3407 }
3408
3409 size_t Metaspace::used_words_slow(MetadataType mdtype) const {
3410 if (mdtype == ClassType) {
3411 return using_class_space() ? class_vsm()->sum_used_in_chunks_in_use() : 0;
3412 } else {
3413 return vsm()->sum_used_in_chunks_in_use(); // includes overhead!
3414 }
3415 }
3416
3417 size_t Metaspace::free_words_slow(MetadataType mdtype) const {
3418 if (mdtype == ClassType) {
3419 return using_class_space() ? class_vsm()->sum_free_in_chunks_in_use() : 0;
3420 } else {
3421 return vsm()->sum_free_in_chunks_in_use();
3422 }
3423 }
3424
3425 // Space capacity in the Metaspace. It includes
3426 // space in the list of chunks from which allocations
3427 // have been made. Don't include space in the global freelist and
3428 // in the space available in the dictionary which
3429 // is already counted in some chunk.
3430 size_t Metaspace::capacity_words_slow(MetadataType mdtype) const {
3431 if (mdtype == ClassType) {
3432 return using_class_space() ? class_vsm()->sum_capacity_in_chunks_in_use() : 0;
3433 } else {
3434 return vsm()->sum_capacity_in_chunks_in_use();
3435 }
3436 }
3437
3438 size_t Metaspace::used_bytes_slow(MetadataType mdtype) const {
3439 return used_words_slow(mdtype) * BytesPerWord;
3440 }
3441
3442 size_t Metaspace::capacity_bytes_slow(MetadataType mdtype) const {
3443 return capacity_words_slow(mdtype) * BytesPerWord;
3444 }
3445
3446 size_t Metaspace::allocated_blocks_bytes() const {
3447 return vsm()->allocated_blocks_bytes() +
3448 (using_class_space() ? class_vsm()->allocated_blocks_bytes() : 0);
3449 }
3450
3451 size_t Metaspace::allocated_chunks_bytes() const {
3452 return vsm()->allocated_chunks_bytes() +
3453 (using_class_space() ? class_vsm()->allocated_chunks_bytes() : 0);
3454 }
3455
3456 void Metaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
3457 assert(!SafepointSynchronize::is_at_safepoint()
3458 || Thread::current()->is_VM_thread(), "should be the VM thread");
3459
3460 if (DumpSharedSpaces && PrintSharedSpaces) {
3461 record_deallocation(ptr, vsm()->get_raw_word_size(word_size));
3462 }
3463
3464 MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag);
3465
3466 if (word_size < TreeChunk<Metablock, FreeList<Metablock> >::min_size()) {
3467 // Dark matter. Too small for dictionary.
3468 #ifdef ASSERT
3469 Copy::fill_to_words((HeapWord*)ptr, word_size, 0xf5f5f5f5);
3470 #endif
3471 return;
3472 }
3473 if (is_class && using_class_space()) {
3474 class_vsm()->deallocate(ptr, word_size);
3475 } else {
3476 vsm()->deallocate(ptr, word_size);
3477 }
3478 }
3479
3480
3481 MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
3482 bool read_only, MetaspaceObj::Type type, TRAPS) {
3483 if (HAS_PENDING_EXCEPTION) {
3484 assert(false, "Should not allocate with exception pending");
3485 return NULL; // caller does a CHECK_NULL too
3486 }
3487
3488 assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
3489 "ClassLoaderData::the_null_class_loader_data() should have been used.");
3490
3491 // Allocate in metaspaces without taking out a lock, because it deadlocks
3492 // with the SymbolTable_lock. Dumping is single threaded for now. We'll have
3493 // to revisit this for application class data sharing.
3494 if (DumpSharedSpaces) {
3495 assert(type > MetaspaceObj::UnknownType && type < MetaspaceObj::_number_of_types, "sanity");
3496 Metaspace* space = read_only ? loader_data->ro_metaspace() : loader_data->rw_metaspace();
3497 MetaWord* result = space->allocate(word_size, NonClassType);
3498 if (result == NULL) {
3499 report_out_of_shared_space(read_only ? SharedReadOnly : SharedReadWrite);
3500 }
3501 if (PrintSharedSpaces) {
3502 space->record_allocation(result, type, space->vsm()->get_raw_word_size(word_size));
3503 }
3504
3505 // Zero initialize.
3506 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
3507
3508 return result;
3509 }
3510
3511 MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType;
3512
3513 // Try to allocate metadata.
3514 MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
3515
3516 if (result == NULL) {
3517 tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype);
3518
3519 // Allocation failed.
3520 if (is_init_completed()) {
3521 // Only start a GC if the bootstrapping has completed.
3522
3523 // Try to clean out some memory and retry.
3524 result = Universe::heap()->collector_policy()->satisfy_failed_metadata_allocation(
3525 loader_data, word_size, mdtype);
3526 }
3527 }
3528
3529 if (result == NULL) {
3530 report_metadata_oome(loader_data, word_size, type, mdtype, CHECK_NULL);
3531 }
3532
3533 // Zero initialize.
3534 Copy::fill_to_aligned_words((HeapWord*)result, word_size, 0);
3535
3536 return result;
3537 }
3538
3539 size_t Metaspace::class_chunk_size(size_t word_size) {
3540 assert(using_class_space(), "Has to use class space");
3541 return class_vsm()->calc_chunk_size(word_size);
3542 }
3543
3544 void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) {
3545 tracer()->report_metadata_oom(loader_data, word_size, type, mdtype);
3546
3547 // If result is still null, we are out of memory.
3548 if (Verbose && TraceMetadataChunkAllocation) {
3549 gclog_or_tty->print_cr("Metaspace allocation failed for size "
3550 SIZE_FORMAT, word_size);
3551 if (loader_data->metaspace_or_null() != NULL) {
3552 loader_data->dump(gclog_or_tty);
3553 }
3554 MetaspaceAux::dump(gclog_or_tty);
3555 }
3556
3557 bool out_of_compressed_class_space = false;
3558 if (is_class_space_allocation(mdtype)) {
3559 Metaspace* metaspace = loader_data->metaspace_non_null();
3560 out_of_compressed_class_space =
3561 MetaspaceAux::committed_bytes(Metaspace::ClassType) +
3562 (metaspace->class_chunk_size(word_size) * BytesPerWord) >
3563 CompressedClassSpaceSize;
3564 }
3565
3566 // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
3567 const char* space_string = out_of_compressed_class_space ?
3568 "Compressed class space" : "Metaspace";
3569
3570 report_java_out_of_memory(space_string);
3571
3572 if (JvmtiExport::should_post_resource_exhausted()) {
3573 JvmtiExport::post_resource_exhausted(
3574 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR,
3575 space_string);
3576 }
3577
3578 if (!is_init_completed()) {
3579 vm_exit_during_initialization("OutOfMemoryError", space_string);
3580 }
3581
3582 if (out_of_compressed_class_space) {
3583 THROW_OOP(Universe::out_of_memory_error_class_metaspace());
3584 } else {
3585 THROW_OOP(Universe::out_of_memory_error_metaspace());
3586 }
3587 }
3588
3589 const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) {
3590 switch (mdtype) {
3591 case Metaspace::ClassType: return "Class";
3592 case Metaspace::NonClassType: return "Metadata";
3593 default:
3594 assert(false, err_msg("Got bad mdtype: %d", (int) mdtype));
3595 return NULL;
3596 }
3597 }
3598
3599 void Metaspace::record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size) {
3600 assert(DumpSharedSpaces, "sanity");
3601
3602 int byte_size = (int)word_size * HeapWordSize;
3603 AllocRecord *rec = new AllocRecord((address)ptr, type, byte_size);
3604
3605 if (_alloc_record_head == NULL) {
3606 _alloc_record_head = _alloc_record_tail = rec;
3607 } else if (_alloc_record_tail->_ptr + _alloc_record_tail->_byte_size == (address)ptr) {
3608 _alloc_record_tail->_next = rec;
3609 _alloc_record_tail = rec;
3610 } else {
3611 // slow linear search, but this doesn't happen that often, and only when dumping
3612 for (AllocRecord *old = _alloc_record_head; old; old = old->_next) {
3613 if (old->_ptr == ptr) {
3614 assert(old->_type == MetaspaceObj::DeallocatedType, "sanity");
3615 int remain_bytes = old->_byte_size - byte_size;
3616 assert(remain_bytes >= 0, "sanity");
3617 old->_type = type;
3618
3619 if (remain_bytes == 0) {
3620 delete(rec);
3621 } else {
3622 address remain_ptr = address(ptr) + byte_size;
3623 rec->_ptr = remain_ptr;
3624 rec->_byte_size = remain_bytes;
3625 rec->_type = MetaspaceObj::DeallocatedType;
3626 rec->_next = old->_next;
3627 old->_byte_size = byte_size;
3628 old->_next = rec;
3629 }
3630 return;
3631 }
3632 }
3633 assert(0, "reallocating a freed pointer that was not recorded");
3634 }
3635 }
3636
3637 void Metaspace::record_deallocation(void* ptr, size_t word_size) {
3638 assert(DumpSharedSpaces, "sanity");
3639
3640 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
3641 if (rec->_ptr == ptr) {
3642 assert(rec->_byte_size == (int)word_size * HeapWordSize, "sanity");
3643 rec->_type = MetaspaceObj::DeallocatedType;
3644 return;
3645 }
3646 }
3647
3648 assert(0, "deallocating a pointer that was not recorded");
3649 }
3650
3651 void Metaspace::iterate(Metaspace::AllocRecordClosure *closure) {
3652 assert(DumpSharedSpaces, "unimplemented for !DumpSharedSpaces");
3653
3654 address last_addr = (address)bottom();
3655
3656 for (AllocRecord *rec = _alloc_record_head; rec; rec = rec->_next) {
3657 address ptr = rec->_ptr;
3658 if (last_addr < ptr) {
3659 closure->doit(last_addr, MetaspaceObj::UnknownType, ptr - last_addr);
3660 }
3661 closure->doit(ptr, rec->_type, rec->_byte_size);
3662 last_addr = ptr + rec->_byte_size;
3663 }
3664
3665 address top = ((address)bottom()) + used_bytes_slow(Metaspace::NonClassType);
3666 if (last_addr < top) {
3667 closure->doit(last_addr, MetaspaceObj::UnknownType, top - last_addr);
3668 }
3669 }
3670
3671 void Metaspace::purge(MetadataType mdtype) {
3672 get_space_list(mdtype)->purge(get_chunk_manager(mdtype));
3673 }
3674
3675 void Metaspace::purge() {
3676 MutexLockerEx cl(SpaceManager::expand_lock(),
3677 Mutex::_no_safepoint_check_flag);
3678 purge(NonClassType);
3679 if (using_class_space()) {
3680 purge(ClassType);
3681 }
3682 }
3683
3684 void Metaspace::print_on(outputStream* out) const {
3685 // Print both class virtual space counts and metaspace.
3686 if (Verbose) {
3687 vsm()->print_on(out);
3688 if (using_class_space()) {
3689 class_vsm()->print_on(out);
3690 }
3691 }
3692 }
3693
3694 bool Metaspace::contains(const void* ptr) {
3695 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(ptr)) {
3696 return true;
3697 }
3698
3699 if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
3700 return true;
3701 }
3702
3703 return get_space_list(NonClassType)->contains(ptr);
3704 }
3705
3706 void Metaspace::verify() {
3707 vsm()->verify();
3708 if (using_class_space()) {
3709 class_vsm()->verify();
3710 }
3711 }
3712
3713 void Metaspace::dump(outputStream* const out) const {
3714 out->print_cr("\nVirtual space manager: " INTPTR_FORMAT, vsm());
3715 vsm()->dump(out);
3716 if (using_class_space()) {
3717 out->print_cr("\nClass space manager: " INTPTR_FORMAT, class_vsm());
3718 class_vsm()->dump(out);
3719 }
3720 }
3721
3722 /////////////// Unit tests ///////////////
3723
3724 #ifndef PRODUCT
3725
3726 class TestMetaspaceAuxTest : AllStatic {
3727 public:
3728 static void test_reserved() {
3729 size_t reserved = MetaspaceAux::reserved_bytes();
3730
3731 assert(reserved > 0, "assert");
3732
3733 size_t committed = MetaspaceAux::committed_bytes();
3734 assert(committed <= reserved, "assert");
3735
3736 size_t reserved_metadata = MetaspaceAux::reserved_bytes(Metaspace::NonClassType);
3737 assert(reserved_metadata > 0, "assert");
3738 assert(reserved_metadata <= reserved, "assert");
3739
3740 if (UseCompressedClassPointers) {
3741 size_t reserved_class = MetaspaceAux::reserved_bytes(Metaspace::ClassType);
3742 assert(reserved_class > 0, "assert");
3743 assert(reserved_class < reserved, "assert");
3744 }
3745 }
3746
3747 static void test_committed() {
3748 size_t committed = MetaspaceAux::committed_bytes();
3749
3750 assert(committed > 0, "assert");
3751
3752 size_t reserved = MetaspaceAux::reserved_bytes();
3753 assert(committed <= reserved, "assert");
3754
3755 size_t committed_metadata = MetaspaceAux::committed_bytes(Metaspace::NonClassType);
3756 assert(committed_metadata > 0, "assert");
3757 assert(committed_metadata <= committed, "assert");
3758
3759 if (UseCompressedClassPointers) {
3760 size_t committed_class = MetaspaceAux::committed_bytes(Metaspace::ClassType);
3761 assert(committed_class > 0, "assert");
3762 assert(committed_class < committed, "assert");
3763 }
3764 }
3765
3766 static void test_virtual_space_list_large_chunk() {
3767 VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity());
3768 MutexLockerEx cl(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3769 // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be
3770 // vm_allocation_granularity aligned on Windows.
3771 size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord));
3772 large_size += (os::vm_page_size()/BytesPerWord);
3773 vs_list->get_new_chunk(large_size, large_size, 0);
3774 }
3775
3776 static void test() {
3777 test_reserved();
3778 test_committed();
3779 test_virtual_space_list_large_chunk();
3780 }
3781 };
3782
3783 void TestMetaspaceAux_test() {
3784 TestMetaspaceAuxTest::test();
3785 }
3786
3787 class TestVirtualSpaceNodeTest {
3788 static void chunk_up(size_t words_left, size_t& num_medium_chunks,
3789 size_t& num_small_chunks,
3790 size_t& num_specialized_chunks) {
3791 num_medium_chunks = words_left / MediumChunk;
3792 words_left = words_left % MediumChunk;
3793
3794 num_small_chunks = words_left / SmallChunk;
3795 words_left = words_left % SmallChunk;
3796 // how many specialized chunks can we get?
3797 num_specialized_chunks = words_left / SpecializedChunk;
3798 assert(words_left % SpecializedChunk == 0, "should be nothing left");
3799 }
3800
3801 public:
3802 static void test() {
3803 MutexLockerEx ml(SpaceManager::expand_lock(), Mutex::_no_safepoint_check_flag);
3804 const size_t vsn_test_size_words = MediumChunk * 4;
3805 const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord;
3806
3807 // The chunk sizes must be multiples of eachother, or this will fail
3808 STATIC_ASSERT(MediumChunk % SmallChunk == 0);
3809 STATIC_ASSERT(SmallChunk % SpecializedChunk == 0);
3810
3811 { // No committed memory in VSN
3812 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3813 VirtualSpaceNode vsn(vsn_test_size_bytes);
3814 vsn.initialize();
3815 vsn.retire(&cm);
3816 assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN");
3817 }
3818
3819 { // All of VSN is committed, half is used by chunks
3820 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3821 VirtualSpaceNode vsn(vsn_test_size_bytes);
3822 vsn.initialize();
3823 vsn.expand_by(vsn_test_size_words, vsn_test_size_words);
3824 vsn.get_chunk_vs(MediumChunk);
3825 vsn.get_chunk_vs(MediumChunk);
3826 vsn.retire(&cm);
3827 assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks");
3828 assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up");
3829 }
3830
3831 const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord;
3832 // This doesn't work for systems with vm_page_size >= 16K.
3833 if (page_chunks < MediumChunk) {
3834 // 4 pages of VSN is committed, some is used by chunks
3835 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3836 VirtualSpaceNode vsn(vsn_test_size_bytes);
3837
3838 vsn.initialize();
3839 vsn.expand_by(page_chunks, page_chunks);
3840 vsn.get_chunk_vs(SmallChunk);
3841 vsn.get_chunk_vs(SpecializedChunk);
3842 vsn.retire(&cm);
3843
3844 // committed - used = words left to retire
3845 const size_t words_left = page_chunks - SmallChunk - SpecializedChunk;
3846
3847 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
3848 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
3849
3850 assert(num_medium_chunks == 0, "should not get any medium chunks");
3851 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
3852 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
3853 }
3854
3855 { // Half of VSN is committed, a humongous chunk is used
3856 ChunkManager cm(SpecializedChunk, SmallChunk, MediumChunk);
3857 VirtualSpaceNode vsn(vsn_test_size_bytes);
3858 vsn.initialize();
3859 vsn.expand_by(MediumChunk * 2, MediumChunk * 2);
3860 vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk
3861 vsn.retire(&cm);
3862
3863 const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk);
3864 size_t num_medium_chunks, num_small_chunks, num_spec_chunks;
3865 chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks);
3866
3867 assert(num_medium_chunks == 0, "should not get any medium chunks");
3868 assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks");
3869 assert(cm.sum_free_chunks() == words_left, "sizes should add up");
3870 }
3871
3872 }
3873
3874 #define assert_is_available_positive(word_size) \
3875 assert(vsn.is_available(word_size), \
3876 err_msg(#word_size ": " PTR_FORMAT " bytes were not available in " \
3877 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
3878 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
3879
3880 #define assert_is_available_negative(word_size) \
3881 assert(!vsn.is_available(word_size), \
3882 err_msg(#word_size ": " PTR_FORMAT " bytes should not be available in " \
3883 "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \
3884 (uintptr_t)(word_size * BytesPerWord), vsn.bottom(), vsn.end()));
3885
3886 static void test_is_available_positive() {
3887 // Reserve some memory.
3888 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3889 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3890
3891 // Commit some memory.
3892 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3893 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3894 assert(expanded, "Failed to commit");
3895
3896 // Check that is_available accepts the committed size.
3897 assert_is_available_positive(commit_word_size);
3898
3899 // Check that is_available accepts half the committed size.
3900 size_t expand_word_size = commit_word_size / 2;
3901 assert_is_available_positive(expand_word_size);
3902 }
3903
3904 static void test_is_available_negative() {
3905 // Reserve some memory.
3906 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3907 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3908
3909 // Commit some memory.
3910 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3911 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3912 assert(expanded, "Failed to commit");
3913
3914 // Check that is_available doesn't accept a too large size.
3915 size_t two_times_commit_word_size = commit_word_size * 2;
3916 assert_is_available_negative(two_times_commit_word_size);
3917 }
3918
3919 static void test_is_available_overflow() {
3920 // Reserve some memory.
3921 VirtualSpaceNode vsn(os::vm_allocation_granularity());
3922 assert(vsn.initialize(), "Failed to setup VirtualSpaceNode");
3923
3924 // Commit some memory.
3925 size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord;
3926 bool expanded = vsn.expand_by(commit_word_size, commit_word_size);
3927 assert(expanded, "Failed to commit");
3928
3929 // Calculate a size that will overflow the virtual space size.
3930 void* virtual_space_max = (void*)(uintptr_t)-1;
3931 size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1);
3932 size_t overflow_size = bottom_to_max + BytesPerWord;
3933 size_t overflow_word_size = overflow_size / BytesPerWord;
3934
3935 // Check that is_available can handle the overflow.
3936 assert_is_available_negative(overflow_word_size);
3937 }
3938
3939 static void test_is_available() {
3940 TestVirtualSpaceNodeTest::test_is_available_positive();
3941 TestVirtualSpaceNodeTest::test_is_available_negative();
3942 TestVirtualSpaceNodeTest::test_is_available_overflow();
3943 }
3944 };
3945
3946 void TestVirtualSpaceNode_test() {
3947 TestVirtualSpaceNodeTest::test();
3948 TestVirtualSpaceNodeTest::test_is_available();
3949 }
3950 #endif